A cellular phone company charges a 49.99 dollar monthly fee for 600 free minutes. Each additional minute costs 35 cents. This mo
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The rock will hit the ground when y=0, so we need to solve this equation for its roots. To do that, we set it equal to 0:
Divide everything by -0.005 to clear out the decimals:
Now use the quadratic formula:
or 
We want the larger x value since the smaller one is when the rock will reach the top of the hole.
Divide everything by -0.005 to clear out the decimals:
Now use the quadratic formula:
We want the larger x value since the smaller one is when the rock will reach the top of the hole.