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levacccp [35]
3 years ago
14

A rock is dropped from a height of 25 feet. The function h=-16t^2 +25 gives the height h of the rock after t seconds. When does

it hit the ground?
Mathematics
1 answer:
scZoUnD [109]3 years ago
3 0

Answer:

5 seconds

Step-by-step explanation:

The ground is 25 eet, so 25=-16t^2+400

-16t^2=-400, 16t^2=400

t^2=25, dividing both sides by 16

t=5 seconds.

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Help me some one plz (only part b)
Slav-nsk [51]

The school can expect to raise 1500p for charity.

<u>Explanation:</u>

(a)

The possibility space is solved in the image attached.

(b)

20p for each player

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Out of 12 outcomes, the probability of getting 7 is 3

So, probability of getting 7 for 120 people = \frac{3}{12} X 120

                                                                  = 30

Money earned from the players = 20p X 120

                                                  = 2400p

Cost of 30 lollipops = 30p X 30

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Money received for charity = 2400p - 900p

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Therefore, the school can expect to raise 1500p for charity.                                

5 0
3 years ago
What is the simplified expression for 3a²+9ab+5-4a²-4ab+3 ​
zheka24 [161]

Answer:

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Step-by-step explanation:

Combining like terms, we get 3a^2 - 4a^2 = -1a^2. We get 9ab - 4ab = 5ab. Then we get, 5 + 3 = 8. Together this is 5ab + 8 - 1a^2

5 0
3 years ago
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7 0
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Answer:

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I hope this helped any.

4 0
3 years ago
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prohojiy [21]
Because it is made to balance like that.
5 0
2 years ago
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