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solmaris [256]
3 years ago
15

A net can be folded to form a cube with a side length of 20 units.

Mathematics
2 answers:
Vitek1552 [10]3 years ago
8 0
The surface area of a cube is the combined area of all of its faces. The faces of a cube are squares, so to find the area of one face, we simply need to multiply the side length, which is 20, by itself.

20 * 20 = 400

So one face has an area of 400 units squared. To find the surface area, we just need to add all of the individual areas together. Cubes have 6 faces, so we can just multiply 400 by the amount of faces there are.

400 * 6 = 2400

The net, when folded into a cube, has a surface area of 2,400 units squared.
Hope that helped! =)
sasho [114]3 years ago
8 0

The answer is B, I took the test.

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Sarah has a collection of nickels, dimes, and quarters worth $28.75. She has 10 more dimes than nickels and twice as many quarte
Ymorist [56]

Answer:

Step-by-step explanation:

Write an equation for each statement:

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"Sarah has a collection of nickels, dimes, and quarters worth $15.75."

.05n + .1d + .25q = 15.75

:

"She has 10 more dimes than nickels"

d = n + 10

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"twice as many quarters as dimes."

q = 2d

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How many coins of each kind does she have?

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Take the 2nd equation and arrange it so n is in terms of d also

n + 10 = d

n = (d - 10)

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In the 1st equation substitute (d-10) for n and 2d for q:

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.05(d-10) + .1d + .25(2d) = 15.75

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.05d - .5 + .1d + .5d = 15.75

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.65d - .5 = 15.75

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.65d = 15.75 + .5

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.65d = 16.25

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d = 16.25/.65

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d = 25 dimes

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Remember the statement "twice as many quarters as dimes."

q = 2(25)

q = 50 quarters

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The statement "She has 10 more dimes than nickels"

n = 25 - 10

n - 15 nickels

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Check our solutions

.05(15) + .1(25) + .25(50) =

.75 + 2.50 + 12.50 = 15.75 proves our solutions

8 0
2 years ago
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andreev551 [17]

Answer:

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Step-by-step explanation:

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alekssr [168]
3,857: 

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So 3,857 is now rounded into 4,000

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Answer:

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