Which of these represents the final step to a no solution problem?

Rewrite in point slope form 4x+5y=20

77julia77 [94]

Answer:

You will have to bring it in the form of Y = mX + c

so, we have to rearrange the equation:

$4x+5y=20\\5y = -4x +20\\y = \frac{-4x +20}{5}\\y = -\frac{4}{5}x + 4$

So if u compare it now( check the attached picture), you will get slope and y -intercept from it

7 0

3 years ago

Read 2 more answers

A marketing researcher wants to estimate the mean savings ($) realized by shoppers who showroom. Showrooming is the practice of

PSYCHO15rus [73]

Answer:

a) $58-1.984\frac{55}{\sqrt{100}}=47.087$

$58+1.984\frac{55}{\sqrt{100}}=68.913$

So on this case the 95% confidence interval would be given by (47.087;68.913)

b) The confience interval calculated from part a is in order to estimate the true mean of savings. And we can extrapolate the results obtained for this new sample size:

$47.087 < \mu < 68.913$

Step-by-step explanation:

Previous concepts

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 means 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.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size

Part a

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=100-1=9$

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,99)".And we see that $t_{\alpha/2}=1.984$

Now we have everything in order to replace into formula (1):

$58-1.984\frac{55}{\sqrt{100}}=47.087$

$58+1.984\frac{55}{\sqrt{100}}=68.913$

So on this case the 95% confidence interval would be given by (47.087;68.913)

Part b

The confience interval calculated from part a is in order to estimate the true mean of savings . And we can extrapolate the results obtained for this new sample size:

$47.087 < \mu < 68.913$

6 0

3 years ago

Write -0.04 as a fraction in simplest form<br>

vova2212 [387]

Answer:

-1/25

Step-by-step explanation:

4 0

3 years ago

When trying to find a common denominator, can you multiply the denominators and get a common denominator?(example: 3/7 2/5

podryga [215]

Answer:

im pretty sure you have to cross muliply

but i learned in school what ever you do to the top do to the bottom

hope it helps

sorry no definet answer

Step-by-step explanation:

3 0

3 years ago

Help me with Geometry

Sergeeva-Olga [200]

$\bf \textit{middle point of 2 points }\\ \quad \\
\begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
% (a,b)
P&({{ 3}}\quad ,&{{ 5}})\quad 
% (c,d)
Q&({{ c}}\quad ,&{{ d}})
\end{array}\quad
% coordinates of midpoint 
\left(\cfrac{{{ x_2}} + {{ x_1}}}{2}\quad ,\quad \cfrac{{{ y_2}} + {{ y_1}}}{2} \right)=(-2,0)\\\\
-----------------------------\\\\
\left(\cfrac{{{ c}} + {{ 3}}}{2}\quad ,\quad \cfrac{{{ d}} + {{ 5}}}{2} \right)=(-2,0)M\implies 
\begin{cases}
\cfrac{c+3}{2}=-2\\\\
\cfrac{d+5}{2}=0
\end{cases}$

if you solve those equations for "c" and "d" respectively, you'd get, well the Q point of c,d

5 0

3 years ago