Since we already have X, I'm guessing all the question asks you to do is plug it in and solve it to get a Y= equation
If I'm right, then the process is
Y=2(3)+1 (putting 3 in place of x)
Y=6+1
Y=7
Which makes 7 your answer
The answer would be B) more than one hope this helped you!
For f(10) replace x with 10 then solve:
f10) = 10^2 + 1
= 100 +1
= 101
504 = 2 x 2 x 2 x 3 x 3 x 7