A.APR.D.7: Inverse Variation 1b
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1 Regents Exam Questions A.APR.D.7: Inverse Variation b Name: A.APR.D.7: Inverse Variation b Which equation shows that p varies inversely as q? ) p = 0q ) pq = 0 3) p = 0 + q 4) q = p + 0 Which statement is true if r varies inversely as s? ) Their difference will be constant. ) Their sum will be constant. 3) Their quotient will be constant. 4) Their product will be constant. 9 In the table below, y varies inversely as x. What is the value of t? 0 In the accompanying table, y varies inversely as x. 3 If x varies inversely as y, which statement is true? ) When x is multiplied by, y is multiplied by. ) When x is multiplied by, y is divided by. 3) When x is divided by, y is divided by. 4) When x is increased by, y is decreased by. 4 If x varies inversely as y and x = when y = 3, what is the value of x when y = 9? 5 If d varies inversely as t, and d = 0 when t =, what is the value of t when d = 5? What is the value of z? Tracy, a political campaign organizer, realizes that the number of hours needed to get out a mailing for her candidate is inversely proportional to the number of campaign workers she has. If she uses the information in the accompanying graph, how many hours would it take to do the mailing if 5 workers are used? 6 If R is inversely proportional to A, and R = 4 when A = 00, what is the value of R when A = 50? 7 If p varies inversely as q, and p = 0 when q = 3, what is the value of p when q = 3 5? 8 The quantities p and q vary inversely. If p = 0 when q =, and p = x when q = x +, then x equals
2 Regents Exam Questions A.APR.D.7: Inverse Variation b The points (,3), 4, 3, and (6,d) lie on the graph 4 of a function. If y is inversely proportional to the square of x, what is the value of d? 3 To balance a seesaw, the distance, in feet, a person is from the fulcrum is inversely proportional to the person s weight, in pounds. Bill, who weighs 50 pounds, is sitting 4 feet away from the fulcrum. If Dan weighs 0 pounds, how far from the fulcrum should he sit to balance the seesaw? 4 The speed of a laundry truck varies inversely with the time it takes to reach its destination. If the truck takes 3 hours to reach its destination traveling at a constant speed of 50 miles per hour, how long will it take to reach the same location when it travels at a constant speed of 60 miles per hour? 5 According to Boyle's Law, the pressure, p, of a compressed gas is inversely proportional to the volume, v. If a pressure of 0 pounds per square inch exists when the volume of the gas is 500 cubic inches, what is the pressure when the gas is compressed to 400 cubic inches? Name: 8 A scholarship committee rewards the school's top math students. The amount of money each winner receives is inversely proportional to the number of scholarship recipients. If there are three winners, they each receive $400. If there are eight winners, how much money will each winner receive? 9 If R varies inversely as S, when S is doubled, R is multiplied by 0 Given y varies inversely as x, when y is multiplied by, then x is multiplied by In a given rectangle, the length varies inversely as the width. If the length is doubled, the width will In the distance formula, rate varies inversely with time. If rate is doubled, time is 3 For a rectangular garden with a fixed area, the length of the garden varies inversely with the width. Which equation represents this situation for an area of 36 square units? 6 Carol notices that the number of customers who visit her coffee shop varies inversely with the average daily temperature. Yesterday, the average temperature was 40 and she had 60 customers. If today s average temperature is 5, how many customers should she expect? 7 The manager of Stuart Siding Company found that the number of workers used to side a house varies inversely with the number of hours needed to finish the job. If four workers can side the house in 48 hours, how many hours will it take six workers working at the same speed to do the same job?
3 A.APR.D.7: Inverse Variation b Answer Section ANS: REF: 09433siii ANS: 4 REF: 0809siii 3 ANS: REF: 0953siii 4 ANS: 4 REF: 00035siii 5 ANS: 8 0 = 5t 8 = t REF: 04a 6 ANS:.6 REF: 007b 7 ANS: = 3 5 p 5 = 3 5 p 5 = p REF: 06a 8 ANS: 4 and 5 0( ) = x( x + ) x x 40 = 0 40 = x + x x x 0 = 0 (x + 4)(x 5) = 0 x = 4,5 REF: 03a
4 9 ANS: REF: 06943siii 0 ANS: REF: 08976siii ANS: 6 REF: 06005b ANS: 3 3 =. 6 d = = 36d = d = 3 REF: 0630a 3 ANS: 5 ft REF: 08007b 4 ANS: hours REF: 08040b 5 ANS: 5 lb/in REF: 06068b
5 6 ANS: 56 REF: 0093b 7 ANS: 3 REF: 06098b 8 ANS: $ = 8x 50 = x REF: 08507a 9 ANS: In inverse variation, the product of the two variables must be constant. If one variable is doubled, the other variable must be halved for the product to remain constant. REF: 00503b 0 ANS: REF: 0650a ANS: be divided by REF: b ANS: halved REF: 0606siii 3 ANS: y = 36 x REF: 0030b 3
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