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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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Answer:

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Step-by-step explanation:

As given in question,

The relation between the price and demand can be given by,

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where is p is price and x is demand.

Since in order to sell 300 cards the price has to be fix at $7.

So,

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And for every additional card they need to drop the price by $0.05.

So,

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