Answer
10 square units per unit
Work Step by Step
First, we note that the equation for area of a square is:
$$A = s^2$$
By taking the derivative of both sides we get:
$$A' = 2s$$
When s = 5, the rate of change, or the derivative at that specific point is:
$$A'(5) = 2(5) = 10\ square\ units\ per\ unit$$
