Pls urgent the graph below plots a function f(x): if x represents time, the average rate of change of the function f(x) in the first three seconds

Find the roots of the equation below. x^2 - 6 + 9 = 0

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

Someone answer this check out the image!