To simplify the expression \(10y - 3(y + 5)\), we will follow these steps:
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Distribute the \(-3\) across the \((y + 5)\): \[ -3(y + 5) = -3y - 15 \]
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Substitute back into the expression: \[ 10y - 3(y + 5) = 10y - 3y - 15 \]
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Combine the \(y\) terms: \[ 10y - 3y = 7y \]
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Thus, we have: \[ 7y - 15 \]
The simplified expression is \(7y - 15\).
So the answer is A. 7y - 15.