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Juliette [100K]
4 years ago
5

Evaluate –7(x – 4y) when x = –4 and y = –6

Mathematics
1 answer:
icang [17]4 years ago
5 0
-7(x - 4y)
-7(-4 - 4(-6))
-7(-4 + 24)
-7(20)
-140
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Step-by-step explanation:

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Luda [366]

Answer:  B, A, B

<u>Step-by-step explanation:</u>

Let's find the z-score for both companies using the formula: z=\dfrac{x-\mu}{\sigma}

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frutty [35]

The time it will take the thermometer to hit the ground is 22 seconds

<h3>Calculating Time </h3>

From the question, we are to determine the how long it would take the thermometer to hit the ground

From the given information,

The equation for the height as a function of time is

h(t) = -16t² + initial height

From the given information,

The thermometer falls from a weather balloon at a height of 7744 ft

∴ Initial height = 7744 ft

When the thermometer hits the ground, h(t) = 0

Thus, we get

0 = -16t² + 7744

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t² = 7744/16

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t = √484

t = 22 seconds

Hence, the time it will take the thermometer to hit the ground is 22 seconds

Learn more on Calculating time here: brainly.com/question/17162388

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