Question

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Answer 1

$1) frac{22p ^{4} q ^{2} }{99p^{5} q} = frac{2*11p ^{4} q ^{2} }{9*11p^{5} q}=frac{2q }{9p} \ \ 2) frac{4a}{a ^{2} +5a} = frac{4a}{a(a+5)} = frac{4}{a+5} \ \ 3) frac{7x-7y}{ x^{2} - y^{2} } = frac{7(x-y)}{(x-y)(x+y)} = frac{7}{x+y}$