16. Evaluate the expression without using a calculator. 1 = 1086 36 17. Use properties of logarithms to condense the logarithmic expression. Write the expression as a single logarithm whose coefficient is 1. Evaluate logarithmic expressions if possible. 2 In (x + 5) -7 In x = 18. Solve the following exponential equation by expressing each side as a power of the same base and then equating exponents. ex +7 = 1 The solution set is {_ 19. Solve the system by the substitution method. xty=3 y = x - 8x+15 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. a. The solution set is { (Type an ordered pair. Use a comma to separate answers if needed.) b. There is no solution. DE# math 1701a1314 Page 8 of 10