A)

Since in the given range the function is continuous and has arguments for which it's greater than zero and less than zero, then the graph of the function must intersect the x-axis, meaning there's at least one zero.

b)

In the part of the graph on the left the function is increasing and on the part on the right it's decreasing. That means there is an extremum (maximum). And where the extremum is, the derivative is equal to 0.

c)

attachment

2.5 customers/min

.4 min/customer

Your answer for that is

D.16

Hope this helped

0.68, 2/3, 65%. Hope this helps!

**Answer:**

d

**Step-by-step explanation:**

d