109 70 + 4 log 7v 3 log zu+4 log 7v- (Simplify your answer) 9. Use the change-of-base formula and a calculator to log 1/5 2 log 1/52 (Do not round until the final answer. Then round to three deci Find the principal needed now to get the given amount, tha To get $500 after 4 years at 7% compounded monthly 10. The present value of $500 is $ (Round to the nearest cent as needed.) Solve the system of equations. If the system has no solution, say that it is inconsistent. Graph the lines of th system. 11. Select the correct choice below and, if necessary, fill answer boxes within your choice. and A. The solution is x-