A i need help again. Which two expressions are equivalent?

A. 7(3 + x) and 7∙ 3 + 3 ∙ x
B. 7 + 3 + x and (7 + 3) + x
C. 7 ∙ x ∙ 3 and 7(x + 3)
D. 7 ÷ (3 – x) and 7 ÷ (x – 3)

B

Step-by-step explanation:

A. these simply to 21 + 7x and 21 + 3x

B. these simplify to 10 + x and 10 + x

C. these simplify to 21x and 7x + 21

D. these simplify to    and  

answer: 1) twenty-seven times y

              2) twenty-seven multiplied by y

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.