book Maths Puzzle Numerical Ability

Use the distributive property to remove the parentheses in the following expression. Then simplify your result if possible.

1/4 (20+16)

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book Other Question

This is for a discussion board and I need to know how to explain this:

Using the index of a sequence as the domain and the value of the sequence as the range, is a sequence a fu g (x) = (x + 7)(x - 8), find g(-4)