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.
Ab is congruent to de so the second choice
He assumes that 60-x and 2x-6 are vertical angles, so he equated these two expressions.
60-x=2x-6
60+6=2x+x
66=3x
x=22
