book Maths Puzzle Numerical Ability

Simplify (x^2+10x+16)/(x^2-64)

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book Other Question

the expense of a bus trip for a group of students was $144. if an additional 6 children were taken, each child would pay $1.20. how many childrenwere there in the original group? I need to simplify

4a^-3b3 / ab^2