Question

Write an equivalent expression.
3 a plus 21
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Part 1
Select all that apply.
A.3 left parenthesis 3 a plus 7 right parenthesis
3 left parenthesis 3 a plus 7 right parenthesis
B.3 left parenthesis a plus 21 right parenthesis
3 left parenthesis a plus 21 right parenthesis
C.3 left parenthesis a plus 7 right parenthesis
3 left parenthesis a plus 7 right parenthesis
D.left parenthesis a plus 7 right parenthesis 3
left parenthesis a plus 7 right parenthesis 3
Select all that apply.

Answer 1

Select C and D.

Explanation: 3a + 21 = 3(a + 7). Option D is the same as C since (a + 7)3 = 3(a + 7).