Perhaps they are a review of stuff you learned in another class?

Anyway:

(where a is a positive number, etc.)

So problem 1:

Note that , so

This can be simplified a little if you like. Note that 15/2 = 7 + 1/2. thus

2)

Note that you can factor a from the LHS:

Now, 27 is not a power of 9. But itisa power of 3:

The bases on each side of the equation are the same, so the exponents must be the same, too.

-Dan