Which of the following choices is equivalent to the algebraic expression 4x + 2y?

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Which of the following choices is equivalent to the algebraic expression 4x + 2y?

a. x + y
b. 2(2x + y)
c. 4x
d. 4(x + 6)
e. (4 + 2) + (x + y)

Answer:

b. 2(2x + y)