Solve the Problem $$H ( x ) = 70 - 4.9 x ^ { 2 }$$

question 150

Multiple Choice

Solve the problem.
-If a rock falls from a height of 70 meters on Earth, the height H (in meters) after x seconds is approximately $$H ( x ) = 70 - 4.9 x ^ { 2 }$$ When does the rock strike the ground? Round to the nearest hundredth, if necessary.

• A) 14.29 sec
• B) 2.92 sec
• C) 3.78 sec
• D) 1.71 sec

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