exam Maths Puzzle Numerical Ability

Solve with exact solutions. I'm not sure what to do. Thanks for your help.

16^2x-1=32

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exam Other Question

A car rental compan has two rental rates. rate 1 is $72 per day plus $0.16 per mile. Rate 2 is $144 per day plus $0.08 per mile. If you plan to rent for one week, how many miles would you need to drive to pay less by taking rate 2? How can $5400 be invested, part of it at 8% and the remainder at 10%, so that the two investments with produce the same amount of interest?
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