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3 years ago

6

Two companies in town sell gravel. Company A sells it for 11 cents a cubic foot. Company B sells it for 3 dollars a cubic yard.

If you need 20 cubic yards of gravel, where should you buy it? How much money will you save?

2 answers:

Tpy6a [65]3 years ago

5 0

Company B because if u multiply 20×3 then you would only have to pay $60 and if u buy it from company A you would have to multiply 11×3 and then multiply 33× 20 and then you would have to pay $660 so u would save more with company B

irina [24]3 years ago

3 0

Answer:

Step-by-step explanation:

<u>Company A</u>

$0.11/1ft 3ft = 1yd

$0.11 x 3ft = $0.33 $0.33 = 1yd

$0.33 x 20yd = $6.60

<u>Company B</u>

$3.00/1yd

$3.00 x 20yd = $60.00

$60 - $6.60 = $53.40

Answer Options

<em>A. Company B, save 40 cents </em>

<em>B. Company B, save 60 cents </em>

<em>C. Company A, save 40 cents </em>

<em>D. Company A, save 60 cents</em>

This was my final answer after i worked out the math, yet my answer does not correspond to the answers given....HELP!

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1 year ago

1. What is the solution of the system?

andreyandreev [35.5K]

Answer:

The given system of equations has solutions below:

1) The solution is (2,3)

2) The solution is ( $\frac{-8}{7}, \frac{5}{7}$ )

3) The solution is infinitely many solutions

4) No solution

Step-by-step explanation:

Given system of equation are

$-x+2y=4\hfill (1)$

$-4x+y=-5\hfill (2)$

To solve equation by using elimination method

Multiply eqn (2) into 2

$-8x+2y=-10\hfill (3)$

Now subtracting (1) and (3)

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x= $\frac{14}{7}$

$x=2$

Substitute x=2 in equation (1)

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2y=4+2

$y=\frac{6}{2}$

y=3

Therefore the solution is (2,3)

2) Given equation is

$-2x+y=3\hfill (1)$

4y-4=x

Rewritting as below

$x-4y=-4\hfill (2)$

To solve equation by using elimination method

multiply (2) into 2

$2x-8y=-8\hfill (3)$

Adding (1) and (3)

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$y=\frac{5}{7}$

substitute $y=\frac{5}{7}$ in (1)

$-2x+\frac{5}{7}=3$

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$-2x=\frac{21-5}{7}$

$x=-\frac{8}{7}$

Therefore the solution is ( $\frac{-8}{7},\frac{5}{7}$ )

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$3x+y=5\hfill (2)$

equation (1) can be written as

2(3x+y)=10

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3x+y=5

Therefore equations (1) and (2) are same therefore it has infinitely many solutions

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multiply equation (1) into 2

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subtracting (2) and (3)

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Step-by-step explanation:

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<em>Hope this helps</em>

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