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2 years ago

X2+ 1 = 9

Mathematics

1 answer:

Aleks04 [339]2 years ago

3 0

Answer:

X = 4

Step-by-step explanation:

x2 + 1 = 9

We have to cross 1 over to the other side so that x becomes a value on its own. Because we are it over, the addition sign changes to subtraction which makes the expression,

x2 = 9- 1

x2 = 8

For x to stand alone we have to divide both sides by 2

x 2/2 = x

and 8/2 = 4

Therefore x=4 (Answer)

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Step-by-step explanation:

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2 years ago

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2 years ago

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kirza4 [7]

<h3>Answer: Choice A</h3>

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d = 2n

================================================

Explanation:

n = number of nickels

d = number of dimes

we have twice as many dimes as nickels, so we could have something like 18 dimes and 9 nickels. Algebraically we would write d = 18 and n = 9. The equation that fits this is d = 2n. The answer is between A and B at this point.

We rule out choice B since the 0.05d is incorrect. It should be 0.10d to represent the total value of all the dimes.

Choice A is correct

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0.10d = value of all the dimes in dollars

n = number of nickels

0.05n = value of all the nickels in dollars

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2 years ago