Which of the following expressions represents 3 less than 5 times a number 2 A) 5n - 3 B) 5 - 3n C) 3n - 5 D) 3 - 5n
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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.