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Mathematics 8 Online
OpenStudy (anonymous):

A projectile is launched upward from a height of 704 feet with an initial velocity of 112 ft/s. The equation gives the height h after t seconds. find the number of seconds until it returns to the ground

OpenStudy (anonymous):

h=-16t^2+112t+704

OpenStudy (jdoe0001):

notice your equation, which you didn't post btw is a negative parabola equation |dw:1389229254330:dw|

OpenStudy (jdoe0001):

so, set y = 0, solve like you'd any other quadratic equation you've surely done many times by now

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