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3 years ago

Evaluate sigma notation k=0 4 3k + 1

Mathematics

1 answer:

defon3 years ago

4 0

The answer should be 126 or A.

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Question is in picture.

Norma-Jean [14]

Answer:

Step-by-step explanation:

Having the system of equations in its simplest form

$\left\{\begin{array}{ccc}ax+by=c\\dx+ey=f\end{array}\right$

$a=d,\ b=e,\ c=f$

then the system of equations has infinitely many solutions.

$a=d,\ b=e,\ c\neq f$

then the system of equations has no solution.

$a\neq d\ or\ b\neq e$

then the system of equations has one solution.

We have the equation

$y=-2x+4$

Convert to the standard form Ax + By = C<em>:</em>

<em /> $y=-2x+4$ <em> add 2x to both sides</em>

$y+2x=-2x+2x+4\\\\2x+y=4$

3 0

3 years ago

A survey of 85 families showed that 36 owned at least one DVD player. Find the 99% confidence interval estimate of the true prop

Katyanochek1 [597]

Answer: $(0.367,\ 0.473)$

Step-by-step explanation:

The confidence interval for population mean is given by :-

$\hat{p}\pm z_{\alpha/2}\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$

, where $\hat{p}$ is the sample proportion, n is the sample size , $z_{\alpha/2}$ is the critical z-value.

Given : Significance level : $\alpha:1-0.99=0.01$

Sample size : n= 85

Critical value : $z_{\alpha/2}=2.576$

Sample proportion: $\hat{p}=\dfrac{36}{85}\approx0.42$

Now, the 99% confidence level will be :

$\hat{p}\pmz_{\alpha/2}\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}\\\\=0.42\pm(2.576)\sqrt{\dfrac{0.42(1-0.42)}{85}}\\\\\approx0.42\pm0.053\\\\=(0.42-0.053,\ 0.42+0.053)=(0.367,\ 0.473)$

Hence, the 99% confidence interval estimate of the true proportion of families who own at least one DVD player is $(0.367,\ 0.473)$

3 0

3 years ago

Where is 25/3 on a number line

natka813 [3]

Answer:

25/3 would be after 8, but before 9. It would be twice as close to 8 as it was 9.

Step-by-step explanation:

In order to find this, simply turn the fraction into a mixed number.

25/3 = 8 1/3

So we know it comes 1/3 after 8 and 2/3 before 9

7 0

3 years ago

I need help fast will give brainiest!!!!

Sergio039 [100]

Answer:

Step-by-step explanation:

Please mark me brainiest

4 0

3 years ago

Work out the area of the shaded shape.<br>

EleoNora [17]

Answer:

hope you understood my handwriting

5 0

3 years ago

Read 2 more answers