If x is a positive integer and x+2 is divisible by 10, what is the remainder whe...【小站备考】

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If x is a positive integer and x+2 is divisible by 10, what is the remainder when

$x^2+4·x+9$ is divided by 10?

A.1

B.3

C.5

D.7

E.9

我的答案：