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kykrilka [37]
3 years ago
10

Mark is solving the following system.

Mathematics
2 answers:
fredd [130]3 years ago
6 0
I think its he didnt eliminate the same variables
miskamm [114]3 years ago
6 0

Solving the system of linear equations Mark tries to apply elementary transformations in order to eliminate one variable.

He makes such steps:

1. He multiplies equation (1) x+y+z=2 by 7 and adds it to equation (3) 4x-y-7z=16. This gives him:

7x+7y+7x+4x-y-7z=14+16,

11x+6y=30.

2. He multiplies equation (3)  4x-y-7z=16 by 2 and adds it to equation (2) 3x+2y+z=8. This step gives him:

8x-2y-14z+3x+2y+z=32+8,

11x-13z=40.

Thus, he did not eliminate the same variables in steps 1 and 2.

Answer: correct choice is C

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Susan's elevation at the top of a mountain is 1,530 meters. After 4 hours of climbing down her elevation is 680 meters. What is
Nitella [24]

Answer:

C) -212.5

Step-by-step explanation:

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4 0
3 years ago
In how many ways can a quality-control engineer select a sample of3 transistors for testing frm a batch of 100 transistors?
Advocard [28]

Answer:

161700 ways.

Step-by-step explanation:

The order in which the transistors are chosen is not important. This means that we use the combinations formula to solve this question.

Combinations formula:

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C_{n,x} = \frac{n!}{x!(n-x)!}

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So 161700 ways.

6 0
3 years ago
Chad washes windows after school to make some extra money. He charges $5.50 to wash each window. If the customer provides the su
Fynjy0 [20]
The second option. The 5.5w part shows that its $5.50 times each window. The -3.25 is because he deducted 3.25 from the total. And then you have the price that he got on the other side. 

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5.5w-3.25=35.25
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3 0
2 years ago
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2x^2-21x-36. Can someone help me out?
sergeinik [125]
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3 years ago
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7. A seed company planted a floral mosaic
jenyasd209 [6]

Answer:

w = 160, L = 50

Step-by-step explanation:

Length = 50 feet

Width = 160 feet

First Find the Length

w = l + 110

P=2w+2l

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420=2(l+110)+2l

420=2l+220+2l

4l=200

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Finding the Width

w=(50)+110

w=160

7 0
2 years ago
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