book Maths Puzzle Numerical Ability

Can someone help with this growth and decay problem please...


The proportion of carbon 14 still present in a sample after t years is given by e^-0.00012t. Estimate the age of

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How can I solve this? Find x.
1. (64) raise to x = 8
2. ([the square root of 49]) raise to 1/2 = x
3. 1/16 = 16 raise to x 6x<30