Answer:
21
Step-by-step explanation:
the angles of a pentagon add up to equal 540 degrees so what setup and equation
540 = 5x+5+4x-10+4x-10+4x+15+4x+15 and solve
step 1 combine like terms
540=25x+15
step 2 subtract 15 from each side
525=25x
step 3 divide each side by 25
x=21
