Is the expression 3^2 • 3^-3 equivalent to 3^3 • 3^-2 explain. If possible please help me answer 20 and 22

15 points ! ~ see if you know the answer to both you!

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two