Question

Given the equation v=-3000t+21000 can be used to find the value of V of a car at the end of t years, is it true that the car will be worth 200 after 7 years 200 dollars that is

Answer 1

v = -3000t + 21000
(200) = -3000t + 21000
200 - 21000 = -3000t
-19000 = -3000t
t = 6.33333...

No, it is not true because the car will be worth $200 in 6.33333... years, not 7 years.

Alternatively, you could plug in t = 7 to find out what the value will be in 7 years.

v = -3000(7) + 21000
v = -21000 + 21000
v = 0

Lol I don't think the car would ever be worth exactly $0, but for purposes of this question it is. So therefore, no, the car wouldn't be worth $200 in 7 years because it would be worth $0 in 7 years, not $200.

Answer 2

LOL! YES funny that a car is worth 0! But thank you so much!