Advanced Math practice question

Answer: A. 4x + 5

Add the x-terms (x + 3x = 4x) and the constants (7 − 2 = 5).

Why the other answers are wrong

B. 3x + 5

The x from the first expression must be counted: x + 3x = 4x.

C. 4x − 5

7 − 2 = +5; the constant stays positive.

D. 4x + 9

The −2 subtracts from 7, giving 5, not 9.

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