In Exercises 79–84, solve for y.
81. 9e^(2y) = = x^2

In Exercises 1–4, solve for t.

2. b. e^(kt) = 10

In Exercises 1–4, solve for t.

e^(sqrt(t)) = x^2

5. e^(2t)-3e^t = 0

In Exercises 79–84, solve for y.

79. 3^y = 2^(y+1)

In Exercises 79–84, solve for y.

83. ln(y-1) = x + ln(y)

13. For what x>0 does x^(x^x) = (x^x)^x? Give reasons for your answer.

Solve the exponential equation.

$4^{x+7}=16$

Solve the exponential equation.

$100^{x}=10^{x+17}$