exam Maths Puzzle Numerical Ability

Can you please help me with these exponential/logarithmic equations?
a) solve 2^x=14
b) solve 3^x+2=81
c) solve log(x+8)= 1 + log(x-10)
Thank you so much for your help.

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exam Other Question

what expression raised to the fourth power is

81x^12y^8z^16
if cosy=-2/sqrt(5) and y is the second quadrant, find cos2y