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What is the approximate total length of iron edging needed to create the square frame and the two diagonals?

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9