Answer
a) $\frac{7}{x}$
b) $\frac{4(x+y)^2}{3}$
Work Step by Step
a) $\frac{7x^2}{x^3}=\frac{7x^2}{x^2\cdot x}=\frac{7}{x}$
b) $\frac{12(x+y)^3}{9(x+y)}=\frac{3(x+y)4(x+y)^2}{3\cdot3(x+y)}=\frac{4(x+y)^2}{3}$
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