All you have to do is look it up on line then put answer key at the end of the thing you looking up
G(x)-f(x)=10x+2- (-8x+5)
=10x+2+8x-5
=18x-3
Answer:
C.
and 
Step-by-step explanation:
The proportion between these fractions is true. Multiply 4/10 (numerator and denominator) by 2.5 to get 10/25. This is the only correct option.
Hope it helps!