book Maths Puzzle Numerical Ability

Question goes like this....

Solve Equation.

2log2 (x+6) - log2 16 = 2

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book Other Question

on chapter 8 page 709 of the prentice hall mathematics Algebra 1 what does
(2t)-6 mean
Express as a single logarithm and, if possible simplify
log(x^3-8)-log(x-2)