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stealth61 [152]

2 years ago

14

0. on a saturday evening in chicago, 34% of the people go out to dinner, 18% go out to

1 answer:

weqwewe [10]2 years ago

5 0

Answer
d. 0.312
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A rocket is launched from a tower. The height of the rocket, y in feet, is related to the time after launch, x in seconds, by th

olchik [2.2K]

Answer:

14.52 seconds.

Step-by-step explanation:

We have been given that the height of the rocket, y in feet, is related to the time after launch, x in seconds, by the given equation $y=-16x^2+224x+121$ . We are asked to find the time, when the rocket will hit the ground.

We know that the rocket will hit the ground, when height will be 0. So to find the time when rocket will hit the ground, we will substitute $y=0$ in our given equation as:

$0=-16x^2+224x+121$

Let us solve for x using quadratic formula.

$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

$x=\frac{-224\pm\sqrt{224^2-4(-16)(121)}}{2(-16)}$

$x=\frac{-224\pm\sqrt{50176+7744}}{-32}$

$x=\frac{-224\pm\sqrt{57920}}{-32}$

$x=\frac{-224\pm240.66574}{-32}$

$x=\frac{-224+240.66574}{-32}, x=\frac{-224-240.66574}{-32}$

$x=\frac{16.66574}{-32}, x=\frac{-464.66574}{-32}$

$x=-0.520804375, x=14.520804375$

Upon rounding to nearest 100th of second, we will get:

$x\approx -0.52, x\approx 14.52$

Since time cannot be negative, therefore, the rocket will hit the ground after 14.52 seconds.

6 0

4 years ago

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What is negative 5/12 plus negative 1/4 plus 3/12

shtirl [24]

-5/12 + (-1/4) + 3/12
Find the least common denominator.
-5/12 - 3/12 + 3/12
Combine like terms.
-5/12 is your final answer.

6 0

3 years ago

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Ok LAst question of the day

Lelechka [254]

Answer:

2 2/5

Step-by-step explanation:

brain power (i dont feel like typing it right now sorry hh))

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3 years ago

Math problem I need help

Gemiola [76]

Answer:

Associative property

Step-by-step explanation:

<u>The given property is:</u>

A + (B + C) = (A + B) + C

which is called "associative property of addition".

Hence, this property is used in the given expression which is "rearranging the parenthesis does not affect the result."

$\rule[225]{225}{2}$

Hope this helped!

<h3>~AH1807</h3>

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2 years ago

Help me plz.image attached

evablogger [386]

Answer: A. -6

Step-by-step explanation:

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3 years ago