Question

Need help with this one it kind of hard

Answer 1

The answer is D because the question is basically asking you to solve for the equation at t = 5. We get:

`v(5) = 45+4(5) = 65`

Since it models speed of the car, and not the time, the answer is D.

Answer 2

we have

`v(t)=35+4t`

where

v(t) is the speed of the car in mph

t is the time in seconds

the domain of the function is the interval ------>
`[35,55]` (given problem)

so

V(5) -----> that means the speed of the car for the time equal to
`5` seconds

Find the speed of the car for
`t=5\ sec`

substitute the value of t in the formula above

`v(5)=35+4*5`

`v(5)=55 mph`

therefore

the answer is the option D

`55 mph`