1. Note that this is a quadratic in . Use the quadratic formula to find 2^x and hence x. As discard any negative solution to the quadratic.

2. . This can then be solved in the same way as above

3. which can also be solved in the same way as above

4. I'm confused, what are you trying to ask?

Use the change of base rule to give you the same base: . I use base e below but any base (that isn't 1 or 0) will work

You can then treat that as a normal fraction question