A dress whose marked price is Rs 360 is sold at a discount of 10%. If the shopkeeper still makes a profit of 20%, the cost of th
1 answer:
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Answer:
- 1
Step-by-step explanation:
h = 20 – 5t2 = 15 -> t = 1
h = 20 – 5t2 = 10 -> t =
interval - 1
<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