SOLUTION: A rock is thrown from the top of a tall building. The distance d in feet, between the rock and the ground t seconds after it is thrown is given by d= -16d squared + 2d + 560. How h

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: A rock is thrown from the top of a tall building. The distance d in feet, between the rock and the ground t seconds after it is thrown is given by d= -16d squared + 2d + 560. How h      Log On

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Question 605635: A rock is thrown from the top of a tall building. The distance d in feet, between the rock and the ground t seconds after it is thrown is given by d= -16d squared + 2d + 560. How high will the rock be after 5.5 seconds?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The equation looks wrong. It should be
+d%28t%29+=+-16t%5E2+%2B+2t+%2B+560+
+d%285.5%29+=+-16%2A5.5%5E2+%2B+2%2A5.5+%2B+560+
+d%285.5%29+=+-16%2A30.25+%2B+11+%2B+560+
+d%285.5%29+=+-484+%2B+571+
+d%285.5%29+=+87+
The rock will be 87 ft off the ground in 5.5 sec