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cestrela7 [59]
3 years ago
5

if a toy rocket is launced vertically upward from ground level with an inital velocity of 128 feet per second, then its high h,

after t seconds is given by the equation h(t)=-9t^2 +81 round to the nearest foot when does the ball hit the ground?
Mathematics
1 answer:
makkiz [27]3 years ago
7 0
The toy rocket hits the ground when h(t) = 0.
So, h(t) = 0 = -9t^2 + 81.

Solving the equation,
-9t^2 = -81
Dividing by -9
t^2 = 9
Taking the square root.
t = 3

The answer is 3 seconds.
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hammer [34]

Answer:

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Step-by-step explanation:

Interest = Principal x Rate x Time

Interest = 100 x 5% x 3

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Interest = 15

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I need helppp... Pleasee I will thank you forever!!
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Answer:

$15    

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Step-by-step explanation:

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3 years ago
Use completing the square to solve for x in the equation (x+7)(x-9) = 25.
balandron [24]

Answer:

x = 1  ±√89

Step-by-step explanation:

We have the equation:

(x+7)(x-9) = 25

Using distributive property:

x(x-9) + 7(x-9) = 25

x²- 9x + 7x - 63 -25 = 0

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x²- 2x - 88 +1 -1 = 0

x²- 2x +1 -88 -1 = 0    (this is a perfect square)

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Solving for x:

(x - 1)² = 89

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3 years ago
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Answer:

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2 years ago
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