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Precalculus 11 Online
OpenStudy (anonymous):

If a rock falls from a height of 90 meters on Earth, the height H (in meters) after x seconds is approximately H(x)=90 - 4.9x^2 . When does the rock strike the ground?

OpenStudy (anonymous):

When H(x)=0, the rock hits the ground. Therefore, you want to solve 0=90-4.9x^2, or 90=4.9x^2. Does that help?

OpenStudy (anonymous):

yeah , tks :)

OpenStudy (anonymous):

:)

OpenStudy (anonymous):

can i ask u this ?

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