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3 years ago

????? don't answer...

Mathematics

1 answer:

kicyunya [14]3 years ago

8 0

Answer:

why?

Most rocks are made of what elements?

Group of answer choices

quartz, granite, marble, limestone, shale, sandstone, obsidian, mica

oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium

carbon, hydrogen, rubidium, nickel, zink, copper, lead, gallium

lithium, nitrogen, selenium, fluorine, chlorine, antimony, gallium, tin

Step-by-step explanation:

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Answer:

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Answer:

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Step-by-step explanation:

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3 years ago

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Kipish [7]

Answer:

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Answer:

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2 years ago

The Cobb family of Fremont is looking at ways to decrease their home water and energy usage. Their current electric hot-water he

OverLord2011 [107]

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

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

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.)

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3 years ago