17. Write the expression as the logarithm of a single number or expression. log 8 - log 2 The expression simplifies to (Simplify your answer.) 18. Write the expression as the logarithm of a single number or expression. 4 In 5 + 2 In 3 4 In 5 + 2 In 3= (Simplify your answer.) 19. Write the expression as the logarithm of a single number or expression. Assume that all variables represent positive numbers. 2 log x - 5 logy 2 log x -5 logy = 20. Write the expression as the logarithm of a single number or expression. Assume that all variables represent positive numbers. 3 log x + 5 logy - 6 log z 3 log x + 5 logy - 6 log z =