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Serhud [2]
3 years ago
8

The height of 2 ball in meters is given by the quadratic equation y= -5+² +14t +3, where t is the time in seconds. After how man

y
seconds will the ball hit the ground?
Mathematics
1 answer:
melisa1 [442]3 years ago
5 0

Answer: after 3 seconds

when  the ball hit the ground => - 5t² + 14t + 3 = 0

⇔ (5t + 1)(t - 3) = 0

⇔ t = 3 or t = -1/5

but t  is a positive integer => t = 3

so the ball will hit the ground after 3 seconds

Step-by-step explanation:

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If the perimeter of the rectangle is 30cm , find its area. W=5 FOR THE WIDTH. 5*10=50 FOR THE AREA.

Step-by-step explanation:

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Step-by-step explanation:

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3 years ago
Two events, A and B, are independent of each other. P(A)=– and P(A and B)
Georgia [21]

Answer:

D: 0.75

P(B) = \frac{6}{8} = 0.75

Step-by-step explanation:

<u>Explanation</u>:-

<u><em>Independent events:</em></u>

If the occurrence of the  event 'B' is not effected by the occurrence or non- occurrence of the event 'A' then the event 'B' is said to be independent of 'A'

or

<em>The two events are independent if the incidence of one event is not affect the probability of other event.</em>

<em>P(A∩B) = P(A) P(B)</em>

Given data A and B are independent events

Given  data

    P(AnB) = \frac{1}{8} and P(A) =\frac{1}{6}

we know that A and B are independent events are

  P(A∩B) = P(A) P(B)

  \frac{1}{8} =  \frac{1}{6}  P(B)

Now calculation we get

P(B) = \frac{6}{8} = 0.75

<u><em>Final answer:</em></u>-

P(B) = \frac{6}{8} = 0.75

7 0
3 years ago
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