Answer:
-39
Step-by-step explanation:
Which gives us -39.
Which Graph Represents A Function? A) B) C) D
1 answer:
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<h3>The first time when the ball will reach a height of 20 feet is 0.42 seconds</h3>
<em><u>Solution:</u></em>
Given that,
<em><u>The height of a ball thrown into the air after t seconds have elapsed is:</u></em>
<em><u>What is the first time, t, when the ball will reach a height of 20 feet?</u></em>
Substitute h = 20
<em><u>Solve by quadractic formula</u></em>
Rounding off we get,
t = 2.08 , t = 0.42
Thus the first time when the ball will reach a height of 20 feet is 0.42 seconds