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vovangra [49]
4 years ago
11

Plz help me with this

Mathematics
1 answer:
shtirl [24]4 years ago
5 0
2x-7y=18 _(1)
-2x+4y=5

11y=23 , Y=23/11 sub in 1

2x-7×23/11=18

2x = 18×11 + 7×23

x = ( 198 + 161 )/2 = 359/2
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Solve this quadratic equation by completing the square. x2 + 10x = 26
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                        x² + 10x = 26
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x(x) + x(5) + 5(x) + 5(5) = 51
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5 0
3 years ago
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You are a landscaper, and you are designing a fence to enclose part of a yard. The section to be enclosed is rectangular and has
pickupchik [31]

Answer:

If you draw this out, you can see that total fence equation will be:

2L + 4W = 1200

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Area;

A = L*W

Substitute (600-2W) for L:

A = (600-2W)*W

A = -2W^2 + 600W; a quadratic equation

 

:

The dimension that will produce the greatest area will be the "axis of symmetry

which is: x = %28-b%29%2F%282a%29

:

In this equation a=-2, b=600

W = %28-600%29%2F%282%2A-2%29

W = %28-600%29%2F%28-4%29

W = +150 ft is the width

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Find the length

L = 600 - 2(150)

L = 300 ft is the length

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We can say the a field 300 by 150 gives he greatest area

:

This illustrated on a graph where y axis is the area and x axis is the width:

Step-by-step explanation:

5 0
3 years ago
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A copy shop charges $0.15 for each black and white copy and $0.80 for each color copy.Write an expression for the cost of m blac
mars1129 [50]
$0.15m + $0.80n

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3 0
3 years ago
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Musya8 [376]
The first box is 9 and the one on the bottom is 36 and then 72
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Simplify (4/5) (5/6) (6/7) (7/8) (8/9)
JulijaS [17]

Answer:

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Step-by-step explanation:

using cross canceling you see

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