Answer:
h/12(12+h)
Step-by-step explanation:
if x=7, f(x)=1/(7+5)=1/12
if x=7+h, f(x)=1/(7+h+5)=1/(12+h)
1/12-1/(12+h)=12+h-12/12(12+h)=h/12(12+h)
7
6x + 20 = 10x - 8
20 + 8 = 10x - 6x
28 = 4x
28 ÷ 4 = x
7 = x
no
because they have different gradients