book Maths Puzzle Numerical Ability

I'm having a hard time on this one. Can someone please help me solve it?

3^4x+5 = 9
That is 3 raised to the power 4x + 5 equals 9 - Solve for X

Thank you

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book Other Question

How would I solve this?:

The Great Pyramid of Cheops has a square base of 756 ft on a side and a height of 481 ft. How many apartments 35 ft x 20 ft x 8 ft would be needed to have a volume equivalent to that of the Great Pyramids?

Thanks! What is the answer to 5^2x = 8?