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ivanzaharov [21]
3 years ago
9

Please Help I will reward brainliest

Mathematics
1 answer:
vodka [1.7K]3 years ago
5 0
I honestly don't know. I worked it out but I don't know if its right so I'm not sure

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Solve the system of equations by substitution y=-2x+18 and 4y-x+9=0
Stells [14]
  • Answer:

<em>x = 9</em>

<em>y = 0</em>

  • Step-by-step explanation:

<em>y = -2x + 18 </em>

<em>4y - x + 9 = 0</em>

<em />

<em>4(-2x + 18) - x + 9 = 0</em>

<em>- 8x + 72 - x + 9 = 0</em>

<em>- 9x + 81 = 0</em>

<em>81 = 9x</em>

<em>x = 81 : 9</em>

<em>x = 9</em>

<em />

<em>y = - 2×9 + 18</em>

<em>y = - 18 + 18</em>

<em>y = 0</em>

3 0
3 years ago
What is the estimate for each sum or difference of 2 1/8 -5/7
dsp73
2 1/8 estimate to 2 
5/7 estimate to 1.

2-1=1
4 0
3 years ago
Nate Dogg's 4/5 of a mile in 1/6 hour. which fraction represents Nate speed in miles per hour.​
Lerok [7]

Answer:

24/5

Step-by-step explanation:

(6) 4/5 ------------ per 1/6h (6)

24/5----------- per 1h

5 0
3 years ago
Assume we need to estimate the mean of a normally-distributed population with great accuracy. Specifically, for significance lev
bulgar [2K]

Answer:

n = 2662.56\sigma^2                                

Step-by-step explanation:

We are given the following in the question:

Significance level = 0.01

Width of interval = 0.1

Population variance = \sigma^2

We have to find the sample size so that the width of the confidence interval is no larger than 0.1

z_{critical}\text{ at}~\alpha_{0.01} = \pm 2.58

Formula for sample size:

n = \displaystyle\frac{z^2\sigma^2}{E^2}

where E is the margin of error. Since the confidence interval width is 0.1,

E = 0.05

Putting these values in the equation:

n = \displaystyle\frac{(2.58)^2\sigma^2}{(0.05)^2} = 2662.56\sigma^2

So, the above expression helps us to calculate the sample size so that the width of the confidence interval is no larger than 0.1 for different sample variances.

4 0
4 years ago
Giving Brainliest!! I just need a pdf/answers to this worksheet, my friends and I are very desperate
Verdich [7]

Answer:

answer down below

Step-by-step explanation:

11.h=-5 12.k=7.8

13.y=-4 14.h=36

15.v=18 16.c=-32

17.k=8 18.x=-29

19.m=28 20.v=11

6 0
3 years ago
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