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tankabanditka [31]
3 years ago
8

Whats x-(4x-7)=5x-(x+21)

Business
1 answer:
AfilCa [17]3 years ago
7 0
X-4x+7=5x-x-21
x-9x+7=-x-21
-8x+7=-x-21
-7x+7=-21
-7x=-28
x=4
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Answer - A (7 years)


WORKINGS

To calculate how long it would take for the new refrigerator to pay for itself in lower utility costs, the cost of new refrigerator will be divided by lower utility cost per year

 

Cost of new refrigerator = $598

 

TO CALCULATE LOWER UTILITY COST PER YEAR

At a cost of only 12 cents per day

Annual cost will be 12 X 365 = 4380 Cents ($43.8)

 

Cost saved annually = Cost of old refrigerator – Cost of new refrigerator.

Lower utility cost per year = $132 – $43.8

Lower utility cost per year = $88.2

 

How long would it take for the new refrigerator to pay for itself in lower utility costs?

$598 ÷ $88.2

= 6.78 years

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3 years ago
Honeybees perform a waggle dance to indicate the direction of
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Aleks04 [339]

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I hope my answer helps you

4 0
3 years ago
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