book Maths Puzzle Numerical Ability

will you solve the following problems please?

1 3 # 3.w #5.Name like terms for : 5a+8-3a+11
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book Other Question

what percent is equal to the fraction 7/8?(the possibilites are .875%, 8.75%, 87.5%, or none of these) Simplify the following expression and write answer with positive exponents only.


(a^-3)^2(a^4)divided by (a^-3)^-3