You deposited 250 in a savings account and it grows by a factor of 1.5 every month Plz plz plz I need this

The graph below could be the graph of which exponential function?

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.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).