How do i solve this pls help me i got 30 mins left :(

Suppose that f(0) = −3 and f '(x) ≤ 8 for all values of x. how large can f(4) possibly be? solution we are given that f is differentiable (and therefore continuous) everywhere. in particular, we can apply the mean value theorem on the interval [0, 4] . there exists a number c such that

Can (2,3 and square root 10) be sides ona right triangle?

What is the missing step in this proof ?