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tangare [24]
3 years ago
7

2x - 5= 5x + 7 linear equations

Mathematics
1 answer:
Bezzdna [24]3 years ago
3 0

Answer:

-4 =x

Step-by-step explanation:

2x - 5= 5x + 7

Subtract 2x from each side

2x-2x - 5= 5x-2x + 7

-5 = 3x+7

Subtract 7 from each side

-5-7 = 3x+7-7

-12 = 3x

Divide by 3

-12/3 = 3x/3

-4 =x

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If 10% of a number equals 30, find 40% of that number.
wlad13 [49]

Answer:

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Step-by-step explanation:

So 10% <em>of</em> a number (let's use n) is 30.

The key word "of" tells us we need to multiply. Therefore, 10% times n is 30:

10\%(n)=30

10% is the same as 0.1. So:

0.1n=30

Divide both sides by 0.1:

n=300

So, our number is 300.

To find 40% of 300, multiply 0.4 and 300. Thus:

.4(300)=120

Our answer is 120.

And we're done!

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