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Pani-rosa [81]
3 years ago
5

Math help me please

Mathematics
1 answer:
GaryK [48]3 years ago
3 0
2/3 is your corect answer
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What is 9+9+9+9+9+9+9++999+9+9+9+9+9+9+9+9+999999+99999++9+9+9+9=?
aliya0001 [1]

Answer: I am going to die of boredom too

Step-by-step explanation: have an awesome amazing day

3 0
3 years ago
What is the equation of the line of best fit for the following data? Round the
Svet_ta [14]

Answer:

S_{xx}=\sum_{i=1}^n x^2_i -\frac{(\sum_{i=1}^n x_i)^2}{n}=438-\frac{44^2}{5}=50.8

S_{xy}=\sum_{i=1}^n x_i y_i -\frac{(\sum_{i=1}^n x_i)(\sum_{i=1}^n y_i)}{n}=415-\frac{44*42}{5}=45.4

And the slope would be:

m=\frac{45.4}{50.8}=0.8937 \approx 0.894

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

\bar x= \frac{\sum x_i}{n}=\frac{44}{5}=8.8

\bar y= \frac{\sum y_i}{n}=\frac{42}{5}=8.4

And we can find the intercept using this:

b=\bar y -m \bar x=8.4-(0.894*8.8)=0.535

So the line would be given by:

y=0.894 x +0.535

And the best option is:

A. y = 0.894x + 0.535

Step-by-step explanation:

We have the following dataset given

x: 5,6,9,10,14

y: 4,6,9,11,12

We want to find the least-squares line appropriate for this data given by this general expresion:

y = mx +b

Where m is the slope and b the intercept

For this case we need to calculate the slope with the following formula:

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

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}

So we can find the sums like this:

\sum_{i=1}^n x_i = 44

\sum_{i=1}^n y_i =42

\sum_{i=1}^n x^2_i =438

\sum_{i=1}^n y^2_i =398

\sum_{i=1}^n x_i y_i =415

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}=438-\frac{44^2}{5}=50.8

S_{xy}=\sum_{i=1}^n x_i y_i -\frac{(\sum_{i=1}^n x_i)(\sum_{i=1}^n y_i)}{n}=415-\frac{44*42}{5}=45.4

And the slope would be:

m=\frac{45.4}{50.8}=0.8937 \approx 0.894

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

\bar x= \frac{\sum x_i}{n}=\frac{44}{5}=8.8

\bar y= \frac{\sum y_i}{n}=\frac{42}{5}=8.4

And we can find the intercept using this:

b=\bar y -m \bar x=8.4-(0.894*8.8)=0.535

So the line would be given by:

y=0.894 x +0.535

And the best option is:

A. y = 0.894x + 0.535

4 0
4 years ago
a flask that weights 345.8g is filled with 225 ml of carbon tetrachloride. Together they weight 703.55g. Calculate density in g/
alina1380 [7]
 703.55  minus the flask weight
-345.8  equals
<span> <span> <span> 357.75 </span> </span> </span>

density = 357.75 / 225 = 1.59 grams / milliliter
density = 1,590 grams / liter



4 0
3 years ago
If the radius of a cylinder is doubled and the height is tripled, what happens to the volume? A) It is multiplied by 6. Eliminat
lana66690 [7]
A. Imagine the circle has a radius of 3 and height of 9. 3 x 9 = 27/3 is 9. If radius is doubled that’s 6 and height is tripled would make it 27. So 6 x 27 is 162 divided by 3 is 54 and 9 x 6 is 54
4 0
3 years ago
Please help w steps! asap
SSSSS [86.1K]

Answer:

(4,6)

Step-by-step explanation:

The midpoint=(\frac{5+3}{2} ,\frac{11+1}{2} )

                      =(4,6)

8 0
3 years ago
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