Answer:
D
Step-by-step explanation:
What we need to do is find the operation between f(x) and g(x) that results in h(x).
Notice how there's a pattern, the value of h(x) is always equal to the values of g(x) and f(x) added together.
This can be represented by the expression (g+f)(x), the expression in D.
Answer: 
Step-by-step explanation:

Once you take off the parenthesis, your sign should change from negative to positive.

The fractions now both have the same denominator. Thus, we can add the numerators.

Therefore, 
Answer:
786
Step-by-step explanation:
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It is just as you show you never do that