book Maths Puzzle Numerical Ability

EVelyn paid $89.25, including 5% tax, for her biology textbook. How much did the book itself cost??

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How do I solve the below equation? I know I have to add the two absolute value equations, but can not find any information on how to add them.

If f(x) = | x + 2| and g(x) = | x - 3 |, then (f + g)(x) = How do I find missing angle measures when I only have 1 angle measure such as 70 degrees or 25 degrees or 30 degrees?