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3 years ago

12

−2x+7y=10 minus 3x+7y=2

1 answer:

viva [34]3 years ago

3 0

Answer:

I would multiply the first equation by −4 and the second by 3 and add together the two equatins (in columns): ... Step 2. Prepare the equations. Multiply every term in each equation by a ... Subtract Equation (4) from Equation (3). ... How do you solve the system 5x−10y=15 and 3x−2y=3 by multiplication?

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If you want to be 95% confident of estimating the population mean to within a sampling error of plus or minus3 and the standard

Aleksandr [31]

Answer:

The sample size required is at least 171

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

What sample size is required?

A samle size of at least n is required, in which n is found when $M = 3, \sigma = 20$

So

$M = z*\frac{\sigma}{\sqrt{n}}$

$3 = 1.96*\frac{20}{\sqrt{n}}$

$3\sqrt{n} = 20*1.96$

$\sqrt{n} = \frac{20*1.96}{3}$

$(\sqrt{n})^{2} = (\frac{20*1.96}{3})^{2}$

$n = 170.7$

Rouding up

The sample size required is at least 171

5 0

3 years ago

I don’t understand this. I can’t process any of it. Someone please help me I need to understand algebra 1

S_A_V [24]

How can I help you with your algebra

3 0

3 years ago

Question 5Multiple Choice Worth 1 points)

kolbaska11 [484]

It would be y=x+3 because you have a slope of 1 and a y-intercept at 3

8 0

3 years ago

9. A circle has a circumference of 34 meters. Which is the closest to its<br> radius?

UkoKoshka [18]

Answer:

5.414

Step-by-step explanation:

Formula to find circumference is 3.14 x 2r

So we can create a algebraic expression.

3.14 x 2r = 34 / 3.14 = 10.828 / 2 = 5.414

7 0

3 years ago

Calculate the average speed of the car in m/s

Alina [70]

Answer:

14.4 m/s

Step-by-step explanation:

The speed of the car can be found by dividing the distance by the time. The distance is 0.8m 9 times or 0.8(9)=7.2 meters and the time is 0.5 seconds

$s=\frac{d}{t} \\s=\frac{7.2}{0.5} \\s=14.4$

3 0

3 years ago