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7-41.

Use the rules of exponents to write each expression in the form $ab^{x}$ .

1. $5^{(x−2)}$

$5^{x} · 5^{ −2}$

1. $92 ^ { \frac { 1 } { 2 } x + 1 }$

$\left (3^{2} \right )^{\frac{1}{2}x+1}$

1. $60 ( \frac { 2 } { 3 } ) ^ { 2 x - 2 }$

$60\cdot \left (\frac{2}{3}\right)^{2x}\cdot \left(\frac{2}{3}\right)^{-2}$