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-\frac{45a}{2}+225
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-\frac{45a}{2}+225
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\frac{45\left(100-10a\right)}{20}
Express 45\times \frac{100-10a}{20} as a single fraction.
\frac{4500-450a}{20}
Use the distributive property to multiply 45 by 100-10a.
\frac{45\left(100-10a\right)}{20}
Express 45\times \frac{100-10a}{20} as a single fraction.
\frac{4500-450a}{20}
Use the distributive property to multiply 45 by 100-10a.
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