What two numbers multiply to -216 and add to get 6

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

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.

Someone me what is the area of this figure? 18m 18m 8m 16m