Answer:
ai) 73000 gal/yr
aii) $730 per year
b) 1000 days
Step-by-step explanation:
ai) The water usage per day is ...
(4 showers/day)(10 min/shower)(5 gal/min) = 200 gal/day
Then the usage per year is ...
(200 gal/day)(365 days/yr) = 73,000 gal/yr
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aii) The cost of electricity is the cost of heating half the water usage, so is ...
(0.20 kWh/gal)(1/2)(73,000 gal/yr)($0.10/kWh) = $730/yr
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b) The current daily cost of electricity for heating water is ...
($730/yr)/(365 days/yr) = $2/day
If the cost is cut in half, it will be $1 per day. That means the savings is $1 per day, so it will take 1000 days to recover the $1000 initial cost. (Effectively, the average cost for the first 1000 days is the same as if the water heater had not been replaced.)
The product of the given fractions, -2/9(-5/3), is: 10/27.
<h3>How to Find the Product of Two Fractions?</h3>
Given the fractions, -2/9(-5/3), recall that minus multiplied by minus equals plus.
So therefore, the product of the two fractions would be a positive number. Thus:
-2/9(-5/3) = (-2 × -5)/(9 × 3)
-2/9(-5/3) = 10/27
Therefore, the product is: 10/27.
Learn more about product of fractions on:
brainly.com/question/82108
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C=71.91. plug 100 into the equation as x, then solve for C
4. 7/4 and 1 3/4
5. 5/2 and 2 1/2
6. 23/8 and 2 7/8
7. 2 1/10
2 1/2
1 8/9
1 8/11
1 3/4
8. 1 6/8 = 1 3/4
1 5/20 = 1 1/4
1 3/6 = 1 1/2
5 2/4 = 5 1/2
4 3/5
9. 21/8 = 2 5/8 pizza (idk if you need to round it to a whole number)
10. She can sell the material because she has 10.5 yds and it only requires 10 yds.
