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Varvara68 [4.7K]
4 years ago
6

At a hardware store, each wooden plank costs $3.57. How much do 12 planks cost?

Mathematics
2 answers:
777dan777 [17]4 years ago
5 0
To find this answer, we need to multiply 3.57 by 12.
3.57 * 12 = 42.84
Therefore, 12 planks will cost $42.84.
Aneli [31]4 years ago
5 0
HI THERE!
I can help you:)


so first we take the number of wooden planks and the price of each one, so that would be $3.57 and 12 wooden planks. since we already know the values of both then we can just skip to multiplying $3.57 times 12 which would be = $42.84  for 12 wooden planks 

-have a wonderful day  :) 
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What is 30 percent of 60
Naily [24]

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3 0
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The area of a circular base of the larger cylinder is 81 pie
gayaneshka [121]

Answer:

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The surface area of the larger cylinder is 3^2. or 9 times the surface area of the smaller cylinder

If proportional dimensional changes are made to a  solid figure, then the surface area will change by  the square of the scale factor of similar solids

Step-by-step explanation:

we know that

If two figures are similar, then the ratio of its areas is equal to the scale factor squared

Let

z ----> the scale factor

x ----> the area of the base of larger cylinder

y --->  the area of the base of smaller cylinder

so

z^{2} =\frac{x}{y}

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x=81\pi\ units^2

y=9\pi\ units^2

substitute

z^{2} =\frac{81\pi}{9\pi}

solve for z

z^2=9\\z=3

<u><em>Verify each statement</em></u>

1) The dimensions of the larger cylinder are 3 times  the dimensions of the smaller cylinder

The statement is true

Because the scale factor is equal to 3 ( see the explanation)

2) The surface area of the larger cylinder is 3^2. or 9 times the surface area of the smaller cylinder

The statement is true

Because, the surface area of the larger cylinder is equal to the surface area of the smaller cylinder multiplied by the scale factor squared

3) If proportional dimensional changes are made to a  solid figure, then the surface area will change by  the square of the scale factor of similar solids

The statement is true

because

If two figures are similar, then the ratio of its areas is equal to the scale factor squared

8 0
3 years ago
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