I picked artificial selection can someone help me plzs

Alawn mower manufacturer incurs a total of 34,816 in overhead costs and 388 per lawn mower in production costs. how many lawn mowers were manufactured if the average cost of productions is 660

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

You work in a hospital that has 9 floors. you need to see 3 patients on each floor. how many patients do you need to see in all?