In Exercises 16–18, write each equation in its equivalent logarithmic form. 13^y = 874

Write each equation in its equivalent logarithmic form. 7^y = 200

In Exercises 19–29, evaluate each expression without using a calculator. If evaluation is not possible, state the reason. log5 (1/5)

Solve each equation. x = log₃ 1/81

In Exercises 19–29, evaluate each expression without using a calculator. If evaluation is not possible, state the reason. log16 4

Solve each equation. log_x 27/64 = 3

Evaluate each expression without using a calculator. log₂ 64

Solve each equation. $x={\log }_8\sqrt[4]{8}$