To use the distributive property to write an equivalent expression for \( 4(10q + 4r - 1) \), you will multiply each term inside the parentheses by \( 4 \).
Here's the step-by-step process:
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Distribute \( 4 \) to \( 10q \): \[ 4 \cdot 10q = 40q \]
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Distribute \( 4 \) to \( 4r \): \[ 4 \cdot 4r = 16r \]
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Distribute \( 4 \) to \( -1 \): \[ 4 \cdot (-1) = -4 \]
Now, combine all the results together:
\[ 40q + 16r - 4 \]
So, the equivalent expression is:
\[ 40q + 16r - 4 \]