The value of a used car can be modeled by the formula v=vo(1-r)^t where vo is the car's purchase price, in dollars; r is the car's constant annual rate of decrease in value, expressed as a decimal; and v is the car's dollar value at the end of t years. a used car has a constant annual rate of decrease in value of 0.075. according to the model, what expression would give the number of years after purchase for the car to reach a value that is 50% of its purchase price?

step-by-step explanation:

42

step-by-step explanation:

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.