Answer:
(B)21+3a
Step-by-step explanation:
An expression is said to be distributive when:

Given the algebraic expression: (7 + a)3
Applying the distributive property

An equivalent expression is 21+3a.
The correct option is B
Answer:
x = 11/2
Step-by-step explanation:
just go by each step
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The measure of angle ABC is 100 because all you do is add the 60 to the 40 and get 100.