just move the 15 the left and divide 5 and u should get c=3
The amount of degrees in a polygon: 360
In a pentagon: 360 / 5 = 72
9x - 18 = 72 Add 18 to both sides
9x = 90 Divide by 9
x = 10
Answer:
Hope this is correct
Step-by-step explanation:
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