Solve the variation problem.The volume V of a given mass of gas varies directly as the temperature T and inversely as the pressure P. A measuring device is calibrated to give  when  and  What is the volume on this device when the temperature is  and the pressure is 

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A. 38 cubic inches
B. 78 cubic inches
C. 118 cubic inches
D. 6.5 cubic inches

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Answer: B

Mathematics

Solve the problem.How many different three-number "combinations" are possible on a combination lock having 22 numbers on its dial? Assume that no numbers repeat. (Combination locks are really permutation locks.)

A. 1.7556 × 105 three-number "combinations" B. 9240 three-number "combinations" C. 1.0534 × 106 three-number "combinations" D. 3.5112 × 105 three-number "combinations"

Let .  If x is divided by 3.02, how is y affected? Round your answer to two decimal places if necessary. ?

A. 0.07 is added to y B. y is multiplied by 1.35 C. y is multiplied by 0.07 D. 1.35 is added to ?y

Solve.How long will it take for the population of a certain country to triple if its annual growth rate is 5%? (Round to the nearest year.)

A. 60 years B. 22 years C. 1 year D. 10 years

Write the expression in lowest terms.

A.
B. - 
C.
D.