Select the correct answer. A population's instantaneous growth rate is the rate at which it grows for every instant in time. Function r gives the instantaneous growth
rate of a bacterial culture x hours after the start of an experiment.
r(x) = 0.01(x+ 2)(x²– 9)
How many hours after the experiment began was the instantaneous growth rate equal to 0?
A. 9
В.3
C.2
D.0

Ineed to know the answer to this algebra question.

Three students, javier, sam, and corrine, participated in a fundraiser where people donated a certain amount of money per lap that the student ran. each student also had some initial donations that were collected before the run. the equations that represent each student's total donation, y, based on the number of laps ran, x, is shown below. match each equation with the correct rate of change for that student.

The formula for the volume of a right square pyramid is given below, where a is the side length of the base and h is the height.