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adoni [48]
2 years ago
13

Solve the system of linear equations by substitution. 4x−2y=14 y=0.5x−1

Mathematics
1 answer:
ANEK [815]2 years ago
3 0
4x - 2(0.5x-1) =14
4x - 1x +2 = 14
3x + 2 = 14
X= 4
Plug that into second equation to get y
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Solve. −43x+16<79 Drag and drop a number or symbol into each box to show the solution.
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The answer is the third one
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3 years ago
Read 2 more answers
I need help pleaseee
Nataly_w [17]
Is this for area and perimeter? If so, first make the fraction a decimal, (that would be 3.5). Then, for permeter, add 3.5 + 3.5 + 9 + 9, which is 25, for area, multiply 3.5 by 9, which is 31.5. Hope this helped!
5 0
3 years ago
Write down the equation of a line whose slope is -7 and crosses the y-axis at 7. Express in slope-intercept form.
Gre4nikov [31]

Answer:

y= -7x+7

Step-by-step explanation:

y= mx+b

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7 0
2 years ago
Express 34% as a fraction in simplest form.<br> A.3/4<br> B.34/100<br> C.8/25<br> D.17/50
Verizon [17]
Hey there!

if i am doing this correct it should be

17/50, let me explain!

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Hope This Helps!!!
7 0
3 years ago
The mean percentange of a population of people eating out at least once a week is 57℅
Sidana [21]

Answer:

<u>The correct answer is B. between 56.45% and 57.55% </u>

Complete statement and question:

The mean percentage of a population of people eating out at least once a week is 57% with a standard deviation of 3.50%. Assume that a sample size of 40 people was surveyed from the population a significant number of times. In which interval will 68% of the sample means occur?

between 55.89% and 58.11%

between 56.45% and 57.55%

between 56.54% and 57.46%

between 56.07% and 57.93%

Source: brainly.com/question/1068489

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Mean percentage of a population of people eating out at least once a week  = 57%

Standard deviation = 3.5%

Sample size = 40

Confidence level = 68%

2. In which interval will 68% of the sample means occur?

For answering this question, we should find out the standard deviation of the sample, using this formula:

Standard deviation of the sample = Standard deviation of the population/√Sample size

Standard deviation of the sample = 3.5/√40

Standard deviation of the sample = 3.5/6.32

Standard deviation of the sample = 0.55

Let's recall that a confidence level of 68% means that 68% of the sample data would have a value between the mean - 1 time the standard deviation of the sample and the mean  + 1 time the standard deviation of the sample. Thus:

57 - 1 * 0.55 = 57 - 0.55 = 56.45

57 + 1  * 0.55 = 57 + 0.55 = 57.55

<u>The correct answer is B. between 56.45% and 57.55% </u>

7 0
3 years ago
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