Answer:
Circumference = 42
Area = 147 to the power of 2
Step-by-step explanation:
7x2=14 diameter
3x14=42 circumference
Area = 7x7x3 =147 to the power of 2
2w+2(10)=30
multioly the 2 and 10
2w+20=30
subtract 20
2w=10
divide by 2
w=5
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A. the rational number system is closed under addition, but not multiplication
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