Answer:
A. 37
Step-by-step explanation:
(fxg) (10) 
Step 1.  G is the second letter, so we first use the equation g(x) = x-4
Step 2.  Plug in ten for x.   g(x) = 10-4
Step 3.  ten minus four is six.  g(x) = 6
Step 4.  Now the new x is 6 and we use the second equation next. 
f(x) = x^2 + 1
Step 5.  Plug in six for x. f(x) = 6^2 + 1
Step 6.  six to the power of two is 36. f(x) = 36 + 1
Step 7.  36 plus one is 37. f(x) = 37
Step 8.  Answer is thirty seven!!!! Cheer!!!!