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3 years ago

Help me pleaseeee !!!

Mathematics

2 answers:

galina1969 [7]3 years ago

3 0

Answer:

you save $5, i can't send a diagram to help though.

Step-by-step explanation:

Mrrafil [7]3 years ago

3 0

Answer:

$5 is how much you will save

Step-by-step explanation:

because 25% of 20 if we add them 5+5+5+5=20 so 1/4 or 25% of 20 is 5

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Can someone pls tell me how to graph to find the solution?

Bas_tet [7]

Answer:

Rearrange the equation so "y" is on the left and everything else on the right.

Plot the "y=" line (make it a solid line for y≤ or y≥, and a dashed line for y< or y>)

Shade above the line for a "greater than" (y> or y≥) or below the line for a "less than" (y< or y≤).

Step-by-step explanation:

sorry if wrong

3 0

3 years ago

An automatic filling machine is used to fill bottles with liquid detergent. A random sample of 18 bottles results in a sample st

Nookie1986 [14]

Answer:

$\frac{(17)(0.038)^2}{32.64} \leq \sigma^2 \leq \frac{(17)(0.038)^2}{6.66}$

$0.0008 \leq \sigma^2 \leq 0.0037$

Step-by-step explanation:

Data given and notation

s=0.038 represent the sample standard deviation

$\bar x$ represent the sample mean

n=18 the sample size

Confidence=97.5% or 0.975

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population mean or variance lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

The Chi Square distribution is the distribution of the sum of squared standard normal deviates .

Calculating the confidence interval

The confidence interval for the population variance is given by the following formula:

$\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma^2 \leq \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}$

The next step would be calculate the critical values. First we need to calculate the degrees of freedom given by:

$df=n-1=18-1=17$

Since the Confidence is 0.975 or 97.5%, the value of $\alpha=0.025$ and $\alpha/2 =0.0125$ , and we can use excel, a calculator or a table to find the critical values.

The excel commands would be: "=CHISQ.INV(0.0125,17)" "=CHISQ.INV(0.9875,17)". so for this case the critical values are:

$\chi^2_{\alpha/2}=32.64$

$\chi^2_{1- \alpha/2}=6.66$

And replacing into the formula for the interval we got:

$\frac{(17)(0.038)^2}{32.64} \leq \sigma^2 \leq \frac{(17)(0.038)^2}{6.66}$

$0.0008 \leq \sigma^2 \leq 0.0037$

3 0

3 years ago

Solve the system using elimination.<br> 5x + 3y = − 8 <br> 7x + 2y = − 20

svlad2 [7]

Your answer should be (-4,4). You would multiply the top row by 2 and the bottom one by -3 to get the y’s the same (both would be 6y) then from there solve for x. once you have x plug in for y.

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3 years ago

after allowing 10% discount on the Marked price of an article is and then 15% vat is charge its price become Rs 16720 how much a

Helga [31]

Answer:18/25

Step-by-step explanation: because if you do that it turned into a c- and the if you round that too window u get 2.35 easy

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3 years ago

Read 2 more answers

Can someone please help????

san4es73 [151]

Answer: