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January 29, 2015

January 29, 2015

Posted by **Haiti** on Sunday, March 31, 2013 at 8:23pm.

second. Will the ball reach a height of 30 feet? If so, how long will it take?

- algebra -
**Reiny**, Sunday, March 31, 2013 at 9:13pmyou should know that

height = -16t^2 + 36t + 4

so 30 = -16t^2 + 36t + 4

16t^2 - 36t + 26 = 0

8t^2 - 18t + 13 = 0

use the quadratic equation to solve for t

( you should get an imaginary root, so the ball never reaches a height of 30 feet)

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