RISE Math Placement Test Practice Test - Cpcc.edu

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RISE Math Placement Test Practice TestIMPORTANT NOTE: This document strives to be ADA compliant. If you use assistivetechnology, please read the information provided in Appendix A for guidance onnavigating this document and for access to the web version of this content.Math Tiers 1, 2, and 3OverviewThere are three RISE math placement tests. Students must earn a 70% on each test to advance to thenext. That is, if students earn a 70% or higher on Test 1, then they can take Test 2. If students do notearn a 70% or higher on Test 2, then they cannot take Test 3.Each test takes approximately 60 minutes to complete.See the lists below of the content areas for each of the tests.Tier 1/Test 1 Whole NumbersFractions and Mixed NumbersDecimalsRatios, Rates and ProportionsPercentsMeasurementGeometryReal NumbersTier 2/Test 2 Solving Equations and InequalitiesGraphingExponents and PolynomialsConcepts in StatisticsTier 3/Test 3 FactoringRational Expressions and EquationsRadical Expressions and Equations and Quadratic EquationsFunctionsThe following pages contain sample test questions and an answer key organized by tier. During thepractice test and real test experiences, students should use the RISE Placement Test Formula KsslbPrN2OV5f0Dhyb7ZHFizAoHvtYX1G-w/edit).1

Tier 1 Practice Test QuestionsWhole Numbers1. You open up a shop in Hawaii and want to offer customers four days of extreme experiences.On the first 2 days the customer can choose a water activity: snorkeling, fishing and waterskiing. The next 2 days, the customer can choose from more extreme activities: zip lining, skydiving, rock climbing, and cave exploring. In how many ways can a customer choose a wateractivity for the first 2 days and then another water activity for last 2 days?a.b.c.d.1271342. Constance wants brand new carpet for her square-shaped bedroom. Her bedroom is 11 ft. by11 ft. How much carpeting will Connie need to purchase to cover half of the floor?a.b.c.d.121 sq. ft.60.5 sq. ft.120 sq. ft.65 sq. ft.3. The Krispy Creme “donuts are ready” sign at three different Krispy Crème locations, lights upwhen the donuts are ready at every 10 minutes, 15 minutes and 20 minutes, respectively. If thetime is 9:00 pm and donuts are ready at all three shops, how many minutes will it take for thesigns to again light up at the same time?a.b.c.d.30 minutes40 minutes50 minutes60 minutes(Test continued on next page)2

Fractions4. In Figure 1, below, there are 3 out of 5 triangles shaded blue. In Figure 2, below, there are 6 outof 10 triangles shaded blue. What fraction represents the total blue shaded triangles betweenFigure 1 and 2?a. 6/5b. 10/12c. 9/15d. 9/10Figure 1(Test continued on next page)3Figure 2

DecimalsFigure 35. In Figure 3, above, the area of each square represents 1/100 of a square inch. As a decimal,which one of the following is true?a. Since the area of each square represents 1/100 of a square inch, then the portion of Figureshaded is representing 0.2 as an equivalent decimal.b. Since the area of each square represents 1/100 of a square inch, then the portion of Figureshaded is representing 0.27 an equivalent decimal.c. Since the area of each square represents 1/100 of a square inch, then the portion of Figureshaded is representing 0.25 as an equivalent decimal.d. Since the area of each square represents 1/100 of a square inch, then the portion of Figureshaded is representing 0.23 as an equivalent decimal.Ratios, Rates and Proportions6. A lime sherbet punch can be made from 2 pints of lime sherbet and 4-liters of Ginger Ale. If Itriple the lime sherbet, how many liters of Ginger Ale will be needed to make the punch?a.b.c.d.410 liters11 liters12 liters13 liters

7. The following prices for pecans are all in proportion except,a.b.c.d. 2 per oz. equals 6 per 3 oz. 4 per 2 oz equals 20 per 10 oz. 9 per 4.5 oz equals 36 per 18 oz. 13 per 6 oz equals 29 per 12 oz.PercentFigure 48. In Figure 4 above, what is the percent of unshaded blocks?a.b.c.d.60%65%70%75%9. What is the discounted price for a pair of shoes that cost 75.00, if the discount is 25%?a. 55.00b. 56.25c. 57.50d. 58.00(Test continued on next page)5

10. What is the original cost of a sofa if it has been discounted 40% and the amount after thediscount is 165.00?a.b.c.d. 275.00 660.00 231.00 412.50MeasurementFigure 511. Figure 5, above, shows the relationship between metric prefixes. If the base unit is meter,convert 87,000 mm to km.a.b.c.d.0.87 km0.0087 km0.087 km0.00087 km12. Laurence purchased a 200 ml bottle of juice and purchased a second 3-liter bottle of juice.What is the difference in liters between the two juice bottle amounts?a.b.c.d.62.08 L2.008 L2.8 L28 L

Figure 613. Figure 6, above, shows a digital scale and the weight of Ms. Roberson’s grandson, Romiin in kg.How many pounds is Romiin? (Round to the nearest whole number)a.b.c.d.125 lbs26 lbs109 lbs59 lbsGeometry14. The circumference of a circle is given by the formula,, where.The radius ofthe tire of a Lexus is 17 inches. Find the circumference of the tire. Round your final answer tothe nearest whole number.a.b.c.d.227 inches53 inches907 inches107 inches(Test continued on next page)7

15. Given the right triangle in Figure 7 below, if a 3 ft and c 5 ft, find b, the missing side.a.b.c.d.3.5 ft2 ft4 ft16 ftFigure 716. Evaluate:a.b.c.d.84.5-1691328,561(Test continued on next page)8

17. For Figure 8 below, find the perimeter of the polygon.Figure 8a.b.c.d.48.1 ft52.1 ft40.1 ft76 ftReal Numbers18. Simplifya.b.c.d.616.54019. Simplifya.b.c.d.21-79-991(Test continued on next page)9.

20. Translate and evaluate the expression, x divided by 4 plus 9, if x 4.a.b.c.d.4/1310191/1321. Simplify the expressiona.b.c.d.-991-222. Simplify the expressiona.b.c.d.1/9-7/181023. Simplifya.b.c.d.21618-216-18(End of Tier 1 test)10.

Tier 1 Answers and ExplanationsWhole Numbers and Fractions1. ANSWER: aThis problem uses the basic principle of multiplication. The shop offers 3 different activities for2 days to choose from and offers 4 more different activities for the next 2 days. Since thequestion wants to know how many extreme sports are possible, and since there are 3 on oneexperience and 4 on the others, then 3 x 4 12. There are 12 possible extreme activities tochoose from.2. ANSWER: bThis problem uses the formula for the area of a rectangle, A l x w. In this case, the shape ofthe room is a square. So, the formula is modified, and the area of a square is A s x s. To coveronly half of the floor divide by 2. A 11 x 11 121/2 60.5 sq. ft.3. ANSWER: dApplying Least Common Multiple (LCM) will solve this problem. For example, at one KrispyCremes, the sign will light up every 10, 20, 30, 40, 50, 60 minutes. At the next donut shop every15, 30, 45, 60 minutes. Lastly, at the third shop every 20, 40, 60 minutes. So, when the signals“are ready” lights up at the same 9:00pm, it will be in every 60 minutes. The LCM for 10, 15,and 20 is 60.4. ANSWER: aWe can write figures 1 and 2 as fractions, 3/5 and 6/10. In order to add these two fractions, thedenominators must be the same. You will need to find the Least Common Denominator (LCD)for fractions 3/5 and 6/10. Finding the multiples of 5, by counting by 5’s: 5, 10, 15, and so on.Finding the multiples of 10, by counting by 10’s: 10, 20, 30, and so on. Looking at the multiplesof 5 and 10, 10 appears to be what both numbers have in common. Now we can use 10 to bethe new denominator for each fraction. Since there is a new denominator, there should be anew numerator. The steps are as follows:.Decimals5. ANSWER: b11

Since each square is 1/100. Counting squares that are blue, there are 27. So, we can write thisas a fraction, 27/100. 27/100 can be written as 27 hundredths. Then writing as an equivalentdecimal, 0.27.Ratios, Rates and Proportions6. ANSWER: cThere are two ratios, 2 pints :4 liters and 6 pints (2 x 3, tripled the amount of sherbet): L liters.Using proportions, and setting the two ratios equal to each other, it follows,.By cross multiplying, 2 x L 4 x 6. Multiplying both sides gives, 2L 24. Solving for L, bydividing both sides by 2, gives, L 12. So, it will take 12 liters of Ginger Ale for 6 pints of LimeSherbet.7. ANSWER: dTo see if two ratios are in proportion, first make sure we are working with the same units,dollars to ounces. Then we set the two ratios equal to each other. Take the cross products ofthe numerator to denominator which must equal. This show proportions. The multiple-choiceanswers that are in proportion are a, b, and c. d is not in proportion because, 13 x 12 6 x 29does not equal the same number. Therefore, the prices are not in proportion of each other.Percent8. ANSWER: dBy simply counting the unshaded blocks, there are 75 out of 100 blocks, unshaded. Thisrepresents 75% unshaded blocks.9. ANSWER: bTo find the discount price, you first multiply the discount rate x the original price. So, multiply,( 75.00 x .25 18.75, remember to change your percent to a decimal by dividing by 100.Therefore, by subtracting 18.75 from the original price of, 75.00, equals the discount price of 56.25.10. ANSWER: aNote that since the discount is 40% of the original price, the price after the discount is 60% ofthe original price. The formula, Percent x Base Amount can be used to find the original price,where Percent 60% 0.6, Base original price, and Amount 165. Substituting into the12

formula gives, 0.6 x original price 165. Solving for the original price by dividing both sides ofthe equation by 0.6 gives 275.Measurements11. ANSWER: cStart counting from the decimal point in the smaller unit, 87,000 mm and move 6 spaces to theleft until you get to Km. Now move the decimal, in the number 87,000, 6 places to the left also.Since this is a whole number, the decimal is behind the last zero in 87.000 mm. The conversionis equal to 0.087Km.12. ANSWER: cThe two bottles must be in the same metric units. Convert 200ml to liters. Using Figure 5above, this gives 0.2 L. Therefore, to find the difference, subtract, 0.2 from 3 and get, 2.8 L.13. ANSWER: aConverting 56.8Kg to pounds, multiplying by 2.2, (1 kg 2.2 pounds), therefore, Romiin weighs124.96 pounds. Rounding to the nearest whole number, the answer is 125 lbs.Geometry14. ANSWER: dThe diameter of the tire is 2 times the radius, which is 34 inches. Using the formula above, C 3.14 x 34 106.76. Rounding 106.76 to the nearest whole number gives 107. So, thecircumference of the Lexus tire is 107 inches.15. ANSWER: cTo find the missing side, b, use the Pythagorean theorem formula,the formula, with its respective values. Therefore,subtract 9 from both sides,13. Replace a and c in

, take the square root of both sides,.16. ANSWER: cTaking the square root of. So, the positive root is 13.17. ANSWER: cTo find the perimeter of the polygon, add all sides around the shape. So, P 4ft 8ft 4ft 4.5ft 14ft 5.6ft 40.1 ft.Real Numbers18. ANSWER: aTranslated as a mathematical expression, denoted as,.Following PEMDAS,,,619. ANSWER: dFollowing PEMDAS, and look for representation of parentheses, working from left to right, takethe square root of 36, take the absolute value of -50,, continuing PEMDAS,left to right you add then subtract,50 6 3556 359120. ANSWER: bTranslated, we have,21. ANSWER: a14. Since.

By following orders of operations, and working from left to right, take the square of 4, bymultiplying 4 times 4, and the same for 5 squared. Then subtract the two from each other, asfollows: 16 – 25 -9.22. ANSWER: dFollowing orders of operations and working in parentheses first, subtracting the fractions gives,6/6 1. Raising 8/9 to the zero power is 1. So 1 – 1 0.23. ANSWER: cTo write in expanded form, is, - 6 x 6 x 6 - 216. The expanded notation is not (-6)(-6)(-6) -216. Although the answer is the same, the number is a positive 6 and not a negative 6.15

Tier 2 Practice Test QuestionsSolving Equations and Inequalities1. Solve the equation below for x,a.b.c.d.x -35x -17x 17x 352. Solve the equation below for y,a.b.c.d.y - 49y 131y 49y - 463. Solve, 7x 11 - 73.a.b.c.d.1213-13-124. Solve:a.b.c.d.y 7/8y 56y 8/7y 8.5. Which equation gives a solution of all real numbers?a. x 1b. x -1c. 2x 2x16

d. 2x 3x6. Which equation matches the following: Henry’s appetite is twice as big as Guy’s? Assume Hrepresents Henry’s appetite and G represents Guy’s appetite.a.b.c.d.2G HGH 22H G2 G H7. In the question above, if Guy can eat 2 full racks of baby back ribs, how many full racks of baby backribs can Henry eat?a.b.c.d.14368. The diagram in Figure 9 below shows 4 graphs of inequalities. Which graph showsFigure 9(Test continued on next page)17?

9. An iguana has to keep its body temperature between 75 degrees and 95 degrees (Fahrenheit).Write this as an inequality, where x represents the iguana’s body temperature.a.b.c.d.10. When solving for h inand then graphing the solution, there will be [----blank----] onthe number line. (Fill in the blank.)a.b.c.d.a closed circlean open circlean asteriska small squareGraphing11. The coordinate plain allows us to plot points. These points are represented by ordered pairs, (x, y).x is called the domain and y is called the range. Given the following ordered pairs,(1,2), (4,6), (8, 10), (12, 14).What are the numbers in the domain?a.b.c.d.{2, 6, 10, 14}{1, 4, 8, 12}{1, 6, 8, 14}{2, 4, 6, 8}(Test continued on next page)18

12. In Figure 10 below, Sponge Bob is drawn on the coordinate plane. In which quadrant is his red tie?a.b.c.d.IIIIIIIVFigure 1013. In a coordinate plane, in which quadrant will you find the ordered pair (-13,-5)?a.b.c.d.IIIIIIIV(Test continued on next page)19

14. Which of the graphs blow represents a linear equation?a.c.b.d.Figure 1115. In Figure 11 below, what is the slope of the given line in simplest form?a. Slope is 2/4b. Slope is ½c. Slope is 4/220

d. Slope is 2/116. In the Figure 12 graph below, assuming lines n and o are parallel, which two lines areperpendicular?a.b.c.d.Lines m and oLines n and oLines l and mLines m and AFigure 1217. The formula, y mx b, can be used to identify the slope and y intercept of a line. Which variablein the formula represents the slope?a. yb. bc. xd. m18. Determine the relationship between the lines, y -2 and x 5.a.b.c.d.21The lines are diagonalThe lines are supplementaryThe lines are parallelThe lines are perpendicular

Figure 1319. In Figure 13 above, what is the slope of the blue line?a.b.c.d.The line doesn’t have a slope.m 2m -2m 0Exponents and Polynomials20. Evaluate the expressiona.b.c.d.1/8-3/8-5/87/821. Given the polynomial expressiona. 5b. 1c. 622, where, an example of a constant would be:

d. 422. Add.a.b.c.d.23. Consider a polygon whose side lengths are described by (x 3) , (x 7) , 2x, 8x, and (-6x-8). Find theperimeter of this polygon.a.b.c.d.5x 13x - 82x 66x 2(Test continued on next page)23

Concepts in Statistics24.There are many types of graphical representations. Which graph records the number ofobservations in a set of data?a. A Frequency Tableb. Bar Graphsc. Box and Whisker Plotd. Circle Graph25. Find the mean of the following 5 NASCAR Motor Speedway tracks: Talladega 2.66 miles Pocono 2.5miles, Atlanta, 1.54 miles, Bristol 0.533 mile, and Lowes (Charlotte) 1.5 miles.a.b.c.d.241.074 miles1.07445 miles1.7466 miles8.733 miles

Figure 1426. In Figure 14 above, the map shows several US hiking trails. What is the mode of the miles given forthe trails?a.b.c.d.There is no mode.751.43 miles259 miles2085 miles(Test continued on next page)25

Figure 1527. In Figure 15 above, the square has the side length described by a polynomial expression. Howmany terms are this polynomial?a.b.c.d.1234(End of Tier 2 test)26

Tier 2 Answers and ExplanationsSolving Equations and inequalities1. ANSWER: dUsing the Addition property of Equality to solve for x, add 9(opposite of -9) to both sides. This isa one- step equation, so the solution for x 35.2. ANSWER: aUsing the Addition property of Equality to solve for y, subtract 41(opposite of -41) from bothsides. This gives,,, divide both sides by -1. The solution for y - 49.3. ANSWER: dUsing the Addition property and multiplication property of Equality, this a two-step equation. So,,,,.4. ANSWER: cApplying the addition rule, add -4y to both sides and add 2 to both sides. This gives 7y 8, dividingby 7 both sides, gives the solution, y 8/75. ANSWER: cTo be all real number the solution shows the left side of the equal sign is equal to the right side ofthe equal sign. 0 0 shows this fact.6. ANSWER: aTranslating into an equation, reading from left to right, Let H be Henry and G be Guy. Then theword “is” means equal to and the word twice means to multiply Guy’s appetite by 2. H 2G.7. ANSWER: bSince G 2, then 2(2) 4.8. ANSWER: cThe graphs show that x has two solutions.27and. An open circle is

represented by the inequalities. A closed circle is represented by the inequalities.9. ANSWER: aThis means that the temperature cannot go below 75 and above 95, but is can be anytemperature between. Representing the temperature as random variable x, the solutionand. Both are open circle because the two end points are not includedas an allowed temperature.10. ANSWER: bIsolate the variable by adding 28 to both sides. The graph of the inequality will beopen since the inequality means “h is greater than 56”.Graphing11. ANSWER: bThe numbers are 1, 4, 8, and 12. These are all the x coordinates, which represents the domainof x.12. ANSWER: dSponge Bob’s red tie is in d. quadrant IV. The quadrants are counted in a counterclockwise directionbeginning with the top right quadrant.13. ANSWER: cThe point (-13, -5) is located in the lower left-hand corner, which is quadrant III. The quadrantsare counted in a counterclockwise direction beginning with the top right quadrant.14. ANSWER: aThere are a series of points on a straight line.15. ANSWER: bThe slope is b, ½, since 3/6 ½.16. ANSWER: aThree linear lines are cross each other in some way. In the above graph, lines b, c and d are crossing28

each other. Line b is being crossed by lines c and d. Lines c and d are crossing each other also.Therefore, these lines are perpendicular.17. ANSWER: dThe lower-case m represents the slope of a line in the formula. The variable x and y represent theconstants and the variable b represents the y intercept.18. ANSWER: dThe line y -2 is a horizontal line (slope is zero), whereas x 5 is a vertical line (slope isundefined). Therefore, the two lines are perpendicular.19. ANSWER: dm 0One way to see that the slope of the given line is zero, is take 2 points on the line and use theslope formula to calculate the slope. For example, take the points (0 , -2) and (3 , -2). Using theslope formula gives:.Exponents and Polynomials20. ANSWER: bThe negative exponent is the exponential rule to apply here. By taking the reciprocal of thewill make the exponent positive. Therefore, the expression becomesand evaluating gives. Replacing x with 2.21. ANSWER: bThe constant in this polynomial expression is 1. Since it is the term without a variable. The othernumbers are called coefficients.22. ANSWER: aBy removing the parentheses, grouping liked terms, adding and using laws of integers, equals,29

23. ANSWER: dBy adding all sides of the polygon, you can find the perimeter and add all liked terms. Therefore,the Perimeter is.Concepts in Statistics24. ANSWER: aA frequency table is the answer. It shows the number of times each data occurs by tally marks.25. ANSWER: cAdding all the values and divide by 5 is 1.7466. This is the mean.26. ANSWER: aThere are no repeated numbers(miles). Thus, there isn’t a mode.27. ANSWER: dThe polynomial expression has 4 terms. A polynomial is an algebraic expression that consists ofmonomials. In this polynomial, there are 4 monomials, therefore has 4 terms.30

Tier 3 Placement Test Practice ProblemsFactoring1. Completely factor the following polynomial by first factoring out the GCF and then factoring theresulting trinomial.a.b.c.d.2. Factor.a.b.c.d.(Test continued on next page)31

3. Factor.a.b.c.d.4. Find the factor thata.b.c.d.5. Solve for x.a.b.c.d.(Test continued on next page)32andhave in common.

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6. A rectangular sheet of paper has an area of. If the length of the paper isthe width, what are the dimensions of the sheet of paper?a.b.c.d.Rational Expressions and Equations7. Divide and simplify.a.b.c.d.(Test continued on next page)34more than

35

8. Simplify and express the result in simplest form.a.b.c.d.9. Solve for x:a.b.c.d.(Test continued on next page)36

10. The time it takes to travel a particular distance varies inversely as the speed traveled. If it takes aperson 15 hours to travel from point A to point B at a speed of 60 miles per hour, how long will ittake to travel from point A to point B at 75 miles per hour?a.12 hoursb.30 hoursc.10 hoursd.18.75 hoursRadical Expressions and Equations and Quadratic Formula11. The formula for the volume of a sphere isthe sphere. Solve the formula for r.a.b.c.d.(Test continued on next page)37, where V is the volume and r is the radius of

12. John and his little brother Kevin have a job that requires them to rake and bag leaves at a largehouse in their neighborhood. Suppose it takes John 2 hours to do the job alone and Kevin 3 hoursto do the job alone. At these rates, how long will it take both boys to complete the job together?a.5 hoursb.1.25 hoursc.1 hourd.1.2 hours13. Simplify:a.b.c.d.14. Simplify:a.b.c.d.(Test continued on next page)38

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15. Simplify:a.b.c.d.16. Rationalize the denominator and simplify the result.a.b.c.d.17. Solve for x:a.b.c.d.40

(Test continued on next page)41

18. Solve for x using the Quadratic Formula:a.b.c.d.19. Use the discriminant to determine the number and type of solutions to the following quadraticequation.a.one real solutionb.two real solutionsc.no solutionsd.two complex solutions(Test continued on next page)42

Functions20. What are the domain and range of the following function?a.b.c.d.21. What are the domain and range of the functiona.b.c.d.43

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22. Graph:a.b.45c.d.

23. Which of the functions below is represented by the following graph?a.b.c.d.46

24. Which function below has a graph that passes through all 4 of these points:a.b.c.d.25. Given thata.b.c.d.(End of Tier 3 test)47, find.

Tier 3 Answers and Explanations1. ANSWER: dThe GCF foris. When this is factored out of, this gives.However, the resulting trinomial in parentheses,factors into two binomials,So, the completely factored result isNote that you can use FOIL to verify that, is factorable. The trinomial.2. ANSWER: cOne way to see that this result is correct is by using FOIL or some other form of the distributiveproperty:Fmultiply first termsO multiply outer termsImultiply inner termsLmultiply last termsNow simplifying, you have.3. ANSWER: dis a binomial that is classified as the difference of two perfect squares. This type ofpolynomial is always factorable. You can check that the answer given is correct by using FOIL:Fmultiply first termsO multiply outer termsI48multiply inner terms

Lmultiply last termsGathering terms and simplifying, you get4. ANSWER: cFor this problem, bothHere are their factorizations:andThe factor that both polynomials have in common isneed to be completely factored.5. ANSWER: dThe given equation,, is a quadratic equation. One means to solve aquadratic equation is by writing it in standard form() and then attempting to factor the trinomial on the left of the equal sign.For the given equation, standard form issides of the original equation. Note that 20 was added to bothThe trinomial to the left of the equals sign does indeed factor. So, in factored form, the equationbecomes.Setting both factors equal to zero and solving for x, you will get.You can see that these two solutions are correct by substituting them back into.49

6. ANSWER: aThe equation that describes the information given in the problem is, where wrepresents the width of the sheet of paper. This is a quadratic equation that in standard form () becomes.To give an equivalent equation that doesn’t contain fractions, you can multiply both sides of theabove equation by 2. The resulting equation is.The trinomial on the left can be factored and now givesSetting both factors equal to zero and then solving for w, you get.Since the width can’t be a negative number, its value isthis, which is 10 in (. The length ismore than).7. ANSWER: cTo simplify, first write the problem in terms of multiplication, thenfactor the trinomials, and finally cancel common factors:50

8. ANSWER: bTo simplify, the fractions need to be written with a common denominator. Forthis rational expression, the least common denominator (LCD) isWriting each fraction in terms of the51, gives.

Finally, factoring the numerator above gives.9. ANSWER: bOne way to solve the rational equation,, is by eliminating the fractions. This can beaccomplished by multiplying both sides of the equation by the least common denominator (LCD) ofthe fractions. In this case, the LCD is 10.Here is the result of multiplying both sides of the equation by 10 and then continuing to solve for x:52

10. ANSWER: aSince the problem deals with inverse variation, it can be modeled with the equationwhere t is the time, v is the speed, and k is proportionality constant.Substitutingandinto the equation and then solving for k, this givesSo, now the general form of the inverse variation equation is53,

To find how long it will take to travel from point A to point B at 75 miles per hour, just substitute 75for v in the general equation:It will take 12 hours to travel from point A to B at a speed of 75 miles per hour.11. ANSWER: dThe solution for this problem requires using algebraic steps to solve the volume formula,, for V:(Explanation continued on next page)54

The last step in isolating r is to take the cube root of both sides of the equation:12. ANSWER: dThere’s more than one way to think about finding a solution to this problem, but here’s oneapproach:Summarizing the information given in the problem, it takes John 2 hours to do the job alone, and ittakes Kevin 3 hours to do the job alone.This means that John could do 3 jobs in 6 hours and Kevin could do 2 jobs in 6 hours. In otherwords, together they could do 5 jobs in 6 hours. Using this rate to calculate the number of hoursper job, you get.13. ANSWER: cSimplifying the radical expression,, requires writing the radicand (part under theradical) in terms of perfect squares since the radical is a square root. Here is the radical simplifiedwith perfect squares:55

The factors highlighted in red are perfect squares, which means that when the square root is taken,the result will be the portion inside parentheses. So further simplifying, you will getThis appears to be the solution, but it isn’t. You were told at the beginning of the problem that, but you were not told anything about the variables x or y. In fact, they could be negativenumbers. If y, in particular, is negative then the above solution is incorrect.So, since we don’t know whether y is negative or positive, the correct solution is.Watch this Absolute Value with Radicals video (https://www.youtube.com/watch?v dqek7EkXcYo)for a detailed explanation of why absolute value bars are necessary for the result.56

14. ANSWER: aFor this problem, since, the final result won’t require any absolute value bars, as was thecase in problem #13. To simplify, distribute and continue simplifying:15. ANSWER: aTo simplify the given radical expression,, the radicand (expression under the radicalsymbol) needs to be expressed in terms of perfect cubes, since the radical is a cube root:The factors in red are perfect cubes, and once the cube root of these is extracted, the result will bethe expression inside the parentheses. So, simplifying further, you have57

(Explanation continued on next page)Note that since the original radical is a cube root (index is odd), there won’t be a need for absolutevalue bars in the final answer. In short, when the index of a radical is odd (cube roots, 5th roots,etc.), or the variables in the radicand are all positive, absolute value bars won’t be necessary in finalresult.16. ANSWER: dTo rationalize the denominator in, means to get rid of the radical in the denominator.This is achieved by multiplying the numerator and denominator of the radical expression byand then simplifying:58

17. ANSWER: bTo solve for x, isolate the radical expression so that it is alone on one side of the equation:59

Now, just square both sides of the above equation. This will cancel the square root.18. ANSWER: bThe Quadratic Formula will be used to solveprovided formula chart:. This can be obtained from the.The first step in obtaining the solution is to write the given quadratic in standard form (). This givesFrom here, identify the constants, a, b, and c, to substitute into the Quadratic Formula.(Explanation continued on next page)60

Substituting these values in the Quadratic Formula gives:Thus, the solutions are.19. ANSWER: dTo determine the number and type of solutions for,the discriminant will be used. The discriminant is the expression under the radical in the QuadraticFormula:.When, the given quadratic equation will have one real solution.When, the given quadratic equation will have two real solutions.When, the given quadratic equation will have two complex solutions.For,into the discriminant gives:61. Substituting these values

This negative result for the value of the discriminant means thatwill have two complex (not real) solutions.20. ANSWER: bIn the function,, the domain is the set of allx-values, and the range is the set of all y-values.

10.What is the original cost of a sofa if it has beendiscounted 40% and the amount after the discount is 165.00? a. 275.00 b. 660.00 c. 231.00