15. 7i()/2 = 630^{0}

16. The first segment of the slide = 15/sin(20degrees) =43.85

the third segment of the slide =15/sin(30 degrees) =30

the middle segement = 110 - 15/tan(20 degrees)-15/tan(30 degrees) =110-41.21-25.98= 110-67.19=42.81

Total slide =43.85+30+42.81 =116.66

17. Period=4

18.sec(-180) =sec(180) = -1

19. the height =210 * tan(63 degrees)=412.85 ft

^{ }

^{. }

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