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neonofarm [45]
3 years ago
10

If 40% of a number is 56, what was the original number?

Mathematics
2 answers:
oksian1 [2.3K]3 years ago
7 0
40/100= 56/x 40x=100(56) 40x=5600 Divide both sides by 40 to get x alone. X=140
kompoz [17]3 years ago
7 0
40/100 = 56/x
0.4 = 56/x
x = 56/0.4 = 140

Therefore the original number is 140.
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Which set of points includes all of the solutions for y = 5/2x + 3/2?
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Answer:

Choice A: (x,\frac{5}{2}x+ \frac{3}{2} ). for all real numbers.

Step-by-step explanation:

We are looking for points on the x-y plane which satisfy the equation y = 5/2x + 3/2, and these point are all those that lie on the graph of the equation, which are points (x,y) = (x,\frac{5}{2}x+ \frac{3}{2} ).

Looking at the other choices we see that choice B gives only 3 points, and regardless of whether they lie on the graph of y or not, this choice cannot be correct because 3 points are not all solutions.

The same goes for choice D.

And choice C is just the whole of x-y plane, therefore this cannot be the answer because not every point on the x-y plane is a solution to  y = 5/2x + 3/2

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Step-by-step explanation:

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3 years ago
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What is the difference in the surface area of two cubes, one with edge 15 and one with an edge of 12
Lilit [14]

Remark

A cube has six sides, all of them equal. The formula for 1 side is s^2. The formula for all six = 6s^2.


Step One

Find the surface area of the larger cube.

Area = 6 *s^2

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Area = 6 *15^2

Area = 6 * 225

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Step Two

Find the area of the smaller cube

Area = 6s^2

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Step Three

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Difference = 6 * (15^2 - 12^2)

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Difference = 486

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