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2 years ago

Mathematics question

Mathematics

2 answers:

LekaFEV [45]2 years ago

6 0

Answer: a

adding the two polynomials will give you the answer a

morpeh [17]2 years ago

4 0

if you'll add the two polynomials above it appeared that the answer is letter B

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Let x be a random variable representing percentage change in neighborhood population in the past few years, and let y be a rando

Lisa [10]

Answer:

$m=\frac{2506.833}{604.833}=4.1447$

Nowe we can find the means for x and y like this:

$\bar x= \frac{\sum x_i}{n}=\frac{77}{6}=12.833$

$\bar y= \frac{\sum y_i}{n}=\frac{587}{6}=97.833$

And we can find the intercept using this:

$b=\bar y -m \bar x=97.833-(4.1447*12.833)=44.644$

So the line would be given by:

$y=4.1447 x +44.644$

Step-by-step explanation:

$m=\frac{S_{xy}}{S_{xx}}$

Σx = 77, Σy = 587, Σx2 = 1593, Σy2 = 70,533, and Σxy = 10040.

Where:

$S_{xy}=\sum_{i=1}^n x_i y_i -\frac{(\sum_{i=1}^n x_i)(\sum_{i=1}^n y_i)}{n}$

$S_{xx}=\sum_{i=1}^n x^2_i -\frac{(\sum_{i=1}^n x_i)^2}{n}$

With these we can find the sums:

$S_{xx}=\sum_{i=1}^n x^2_i -\frac{(\sum_{i=1}^n x_i)^2}{n}=1593-\frac{77^2}{6}=604.833$

$S_{xy}=\sum_{i=1}^n x_i y_i -\frac{(\sum_{i=1}^n x_i)(\sum_{i=1}^n y_i){n}}=10040-\frac{77*587}{6}=2506.833$

And the slope would be:

$m=\frac{2506.833}{604.833}=4.1447$

Nowe we can find the means for x and y like this:

$\bar x= \frac{\sum x_i}{n}=\frac{77}{6}=12.833$

$\bar y= \frac{\sum y_i}{n}=\frac{587}{6}=97.833$

And we can find the intercept using this:

$b=\bar y -m \bar x=97.833-(4.1447*12.833)=44.644$

So the line would be given by:

$y=4.1447 x +44.644$

5 0

3 years ago

kathleen bought 4 dresses that each cost the same amount and a pair of jeans that cost $40 the iteams she bought cost a total of

polet [3.4K]

The question seems incomplete, but if you are trying to figure out how much each dress costs, The answer would be $30.

To find the answer all you need to do is;
1. Subtract the price of the jeans ($40) From the total price.
160-40=120

2. Now we know the total price of the Dresses, and we also know she bought 4 of them, this means we can divide the total price ($120) of dresses, by the number (4) of dresses bought.
120/4 = 30.

So therefor, each dress costs $30 Dollars.

Hope this Helps! - Giz

7 0

3 years ago

Write 7/40 as a<br> percent. explain plz

Free_Kalibri [48]

17.5

This is because if you do the math: (7/40)*100 you get 17.5!

So divide 7 by 40 and then multiply it by 100!

7/40=0.175
0.175*100=17.5

8 0

2 years ago

HELP PLEASE WILL GIVE BRAINLIST

Juliette [100K]

Answer:

its 15.75 please give me brainliest hope I helped

3 0