Question

Gary learned that the value of his car depreciates by 15% percent per year. Which of the following functions best describes the value of his car the year after the car is worth m dollars?

A.f(m)=0.15m

B.f(m)=0.85m

C.f(m)=1-0.15m

D.f(m)=1-0.85m

Answer 1

Answer: f(m) = 0.85m

Step-by-step explanation: if a car decreases in value by 15% each year, it means that in a given year it will be 85% of its value, m, the previous year.

Therefore, the value will be:

f (m) = 0.85m

Answer 2

For this case we have that the original value of the car is:
m dollars
For the following year we have the value is:
((100-15) / (100)) m
Rewriting we have:
((85) / (100)) m
0.85m
Answer:
the value of his car the year after the car is worth m dollars is:
B.f (m) = 0.85m