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Question 7: Option (4)
[tex]A=(3/8)^2=\frac{9}{64}[/tex]
Question 8: Option (3)
[tex]A=\frac{1}{2}(17)(9)=76.5[/tex]
Question 9: Option (2)
[tex]A=\pi(10)^2 \approx 314[/tex]