P E M D A S
Parentheses first:
So, 12 + 4 x 13 - 2
12 + 52 - 2
64 - 2
62
B and C are correct, A and D are incorrect
Evaluate the given function in x=-4.
This is, replace the x in the function for -4 and find the value of g(-4).

The value of g(-4) is 32.
1/2 x s, where s equals 3/10 means,
(1/2) x (3/10) which will give (3/20)
You simply multiply the numerators to get 3 and the denominators to get 20.
Multiply 7 by 9 and you will get 63 which is x.