question_answer

In the following number machine if 5 goes in, 8 comes out. If 7 goes in, 10 comes out. If 11 goes in 14 comes out and so on. If x goes in, what number should come out?

A) \[3x\]                       

B) Y

C) \[x-5\]                   

D)      \[x+3\]

E) None of these