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nika2105 [10]
3 years ago
14

A pen drops from the top of a desk that is 4 feet tall. The distance from the pen to the ground can be modeled by the equation b

elow, where h(t) is the height from the ground and t is the time in seconds, How long will it take for the pen to reach the ground? Round your answer to the nearest tenth of a second
h(t)=-16t^2+4
Mathematics
1 answer:
Tcecarenko [31]3 years ago
4 0

Answer:

0.5 seconds

Step-by-step explanation:

On the ground, height is 0

-16t² + 4 = 0

16t² = 4

t² = 4/16

t² = ¼

t = ½

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Answer:

72

Step-by-step explanation:

Well to make life easier just simplify the fraction

80/100 could be simplified to 4/5

4/5*90 is 72

7 0
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7 over 9 divided by 3
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Fraction is 7/27 or 0.259
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if each side of a square classroom is 25 feet then what is the perimeter of the room? what is the area of the floor of the room?
Svetllana [295]

Answer:

P = 100

Area = 625

Step-by-step explanation:

Area = s^2

sqrt(area) =  sqrt(s^2)

area = 25*25

sqrt(25*25) = sqrt(s^2)

s = 25

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4 0
3 years ago
Javier's parents set an amount of money aside when he was born. They earned 4.5% simple interest on that money each year. When J
solmaris [256]

Answer:

Javier's parents set aside $1500 when he was born

Step-by-step explanation:

This is a simple interest problem.

The simple interest formula is given by:

E = P*I*t

In which E is the interest earned, P is the principal(the initial amount of money), I is the interest rate(yearly, as a decimal) and t is the time.

In this question, we have that:

E = 1012.50, t = 15, I = 0.045

We have to find P. So

E = P*I*t

1012.50 = P*15*0.045

P = \frac{1012.50}{15*0.045}

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6 0
3 years ago
You have 20 bucks in your pocket.
diamong [38]

Answer:

the answer would be $45.55

<3

Step-by-step explanation:

20$ + $50.00 = $70

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$64.5 - $9.95 = $54.55

$54.55 - $20 = $34.55

$34.55 + $15 = $49.55

$49.55 - $4 = $45.55

5 0
3 years ago
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