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3 years ago

Which expression doesn't belong? Why does it not belong? A. 7.9x B. 7.9 · (-10) C. 7.9 + x D. - 79

Mathematics

1 answer:

motikmotik3 years ago

7 0

Answer:

C. 7.9 + x

Step-by-step explanation:

Given - A. 7.9x B. 7.9 · (-10) C. 7.9 + x D. - 79

To find - Which expression doesn't belong? Why does it not belong?

Proof -

As given

A. 7.9x

B. 7.9·(-10)

C. 7.9 + x

D. -79

As we can see that Option A, B, D are the multiple of 7.9 but Option C is not the multiple of 7.9

So, Option C does not belong here.

∴ we get

The correct answer is - C. 7.9 + x

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Leviafan [203]

The equation that we can create from this situation is:

i = (190 – 5 x) * (29 + x)

where i is the income and x is the increase in daily rate

Expanding the equation:

i = 5510 + 190x – 145x - 5x^2

i = -5x^2 + 45x + 5510

Taking the 1st derivative:

di/dx = -10x +45

Set to zero to get the maxima:

-10x + 45 = 0

x = 4.5

So the cars should be rented at:

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The maximum income is:

i = (190 – 5*4.5) * (33.5)

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3 years ago

The area of a rectangle is 27ft squared, and the length of the rectangle is 3ft less than twice the width. Find the dimensions o

oksano4ka [1.4K]

Answer:

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Step-by-step explanation:

w = x

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Answer:

Step-by-step explanation:

Almost correct. I'd write this statement as follows:

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3 years ago

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xenn [34]

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