Answer:
25
Step-by-step explanation:
Since the lines are perpendicular the opposite angle of labeled is also 60° and so would the two angles on the the lower just opposite way therefore 8x-4=60
-4 -4
8x=56
/8 /8
X=7
I could be wrong but I got 28. I devided 420 by 15
The Correct Answer Is f(x)=2.5x+5