PLEASE HELP! will mark brainliest

Given an exponential function for compounding interest, A(x) = P(.91)x, what is the rate of change?

−0.09%
−9%
0.91%
91%

Which of the following is the solution to the equation 25(z + 2) = 125?

z = 5.5
z = 3.5
z = −2.5
z = −0.5