Answer:
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Step-by-step explanation:
42, 84, 126, 168
Sum of internal angles= 4*180 = 720
x+2x+3x+4x+140+160= 720
10x= 720 - 300
10x= 420
x=42, 2x= 84, 3x= 126, 4x= 168
32÷8+12=16
32÷8=4
4+12=16
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