a)

You can get the same base here since , so that you may write:

Now equate exponents, and solve for .

b)

Use the substitution so that you may nor write:

Now, solve the resulting quadratic, then back substitute for .

c)

Divide through by 3 to get:

Now convert from logarithmic to exponential form and solve for .

d)

Convert from exponential to logarithmic form:

Now solve for using the square root property.

e)

Take the natural log of both sides to get:

Now solve for .