Answer: Third option is correct.
Step-by-step explanation:
Since we have given that
The graph of the derivative of f(x) , say, y = f'(x), is symmetry about the origin.
so, it is an odd function.
So, f(x) must be an even function.

So, the value of f(-2) is equal to 8.
Hence, Third option is correct.
Answer:
9
Step-by-step explanation:
if the number of boys is x ,then the number of girls is x+7,so 2x+7=35,we can know x=9,so the number of boys is 9,and girls are 16
Answer:
(10, 4, -3)
Step-by-step explanation:
z = -3
y + z = 1
y - 3 = 1
y = 4
x + y - z = 17
x + 4 - -3 = 17
x + 4 + 3 = 17
x + 7 = 17
x = 10
(10, 4, -3)