To express \( 7 + 21 \) as a product of two factors, we first simplify \( 7 + 21 \):
\[ 7 + 21 = 28 \]
Now, we need to find an expression among the options that simplifies to 28.
Let's evaluate each option:
A) \( 3(3 + 7) = 3 \times 10 = 30 \)
B) \( 3(1 + 7) = 3 \times 8 = 24 \)
C) \( 7(3 + 3) = 7 \times 6 = 42 \)
D) \( 7(1 + 3) = 7 \times 4 = 28 \)
The correct answer is:
D - \( 7(1 + 3) \), which equals 28.
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