Question

On a cold January morning, the radiator fluid in Kuri’s car is -15° F. With the engine running, the temperature rises by 2.5°F per minute. How long before the radiator temperature reaches 40°F?

Answer 1

Please you have to use the subsequent function:
\[T(t)=T _{0}+kt\]
where T(t) is the temperature at the time t,
T_0 is the initial temperature, namely -15°F
k is your rate, namely 2.5 °F/min.
If we suppose that at the time t_1 T is 40°F, then, we can write:
\[T(t _{1})=-15+2.5*t _{1}=40\]
Solve this equation for t_1, and you will get your answer.

Answer 2

it is 22 thanks

Answer 3

Thanks!

Answer 4

your answer is right!