Answer:
x = 20 degrees
Step-by-step explanation:
5 sided polygon = 540 degrees
A + B + C + D + E = 540
(4x+10) + (6x+10) + (5x-5) + (4x+5) + (7x) = 540
below is the same thing without the parenthesis
4x+10 + 6x+10 + 5x-5 + 4x+5 + 7x = 540
Combine like terms
(4x + 6x + 5x + 4x + 7x) + (10 + 10 - 5 + 5) = 540
26x + 20 = 540
Subtract 20 from both sides
26x = 520
Divide both sides by 26
x = 20
