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kiruha [24]
3 years ago
5

The US uses roughly 4.0 million Gigawatt-hours per year in electricity. Currently 50% of out electricity comes from coal. If eve

ry 1.0 kilowatt-hour of coal burned releases 2 lbs of carbon dioxide, how much carbon dioxide is released from burning coal for electricity each year in the US?
Mathematics
1 answer:
sergey [27]3 years ago
4 0
4 trillion pounds.

1 gigawatt-hour is equal to 1,000,000 kilowatt-hours.

Out of our 4,000,000 gigawatt-hours, 50% of it comes from coal; this is 2,000,000 gigawatt-hours.

2,000,000(1,000,000) = 2,000,000,000,000 (2 trillion) kilowatt-hours.

Since each kilowatt-hour is 2 lbs of carbon dioxide, 2 trillion * 2 = 4 trillion lbs of carbon dioxide.
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The position of an object moving vertically along a line is given by the function s(t) = -16t^2 + 128t. Find the average velocit
adoni [48]

Answer:

a) 48

b) 64

c) 80

d) 96-16h

Step-by-step explanation:

a) s(1)=112 and s(4)=256

average velocity on [1,4] = (256-112)/(4-1) = 48

b) s(1)=112 and s(3)=240

average velocity on [1,3] = (240-112)/(3-1) = 64

c) s(1)=112 and s(2)=192

average velocity on [1,2] = (192-112)/(2-1) = 80

the next one's tricky to type. watch the parentheses carefully:

d) s(1)=112 and s(1+h)= -16(1+h)^2 + 128(1+h)

average velocity on [1,1+h] =

(s(1+h) - s(1))/((1+h)-1) = (-16(1+h)^2 +128(1+h) - (112))/h

= (-16(1+2h+h^2)+128+128h - 112)/h

= ( -16 -32h -16h^2 + 16 + 128h)/h

= ( 96h - 16 h^2)/h

= 96 - 16h

6 0
3 years ago
Which equation describes the same line as y-5= -2(x + 4)?
skad [1K]

Answer:

A. y = -2x - 3

Step-by-step explanation:

y-5= -2(x + 4)

Expand the brackets.

y - 5 = -2x - 8

Add 5 to both sides.

y = -2x - 8 + 5

y = -2x - 3

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4 years ago
work out the area of a circle with diameter 1.8cm take pie to be 3.142 and give your answer to 1 decimal place.
Masja [62]
Area of a circle = Pi x r^2
Area = Pi x 3.24
Area = 10.18...
Area = 10.2 cm
6 0
3 years ago
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Hatshy [7]

Answer:

read your notes and work it out slowly :)

Step-by-step explanation:

xoxo, liverwentsplat

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3 years ago
What’s the answer for this question
Shtirlitz [24]

Answer:

4578.12 ft³

Step-by-step explanation:

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3 years ago
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