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vichka [17]
3 years ago
6

Can anyone expand and simply this for me (3x +2)(2x-5) ?​

Mathematics
1 answer:
Snowcat [4.5K]3 years ago
5 0

Answer:    5x-3

Step-by-step explanation:

3x+ 2x +2-5

5x        -3

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What is an obtuse angle?
natali 33 [55]
An obtuse angle is an angle that is in between 90 degrees and 180 degrees. It looks like this 

5 0
3 years ago
The least-squares regression model y =−3.4+5.2x and correlation coefficient r=−0.66 were calculated for a set of bivariate data
Makovka662 [10]

Answer:

r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}  

For this case the value of r = -0.66

Now we can calculate the determination coeffcient:

r^2 = (-0.66)^2 = 0.4356

And then we can conclude that 43.56% of the variation in y can be explained by the explanatory variable

And then 100-43.56 = 56.44 % of the variation in y that cannot be explained by the explanatory variable

Step-by-step explanation:

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}

\bar x= \frac{\sum x_i}{n}

\bar y= \frac{\sum y_i}{n}

And we can find the intercept using this:

b=\bar y -m \bar x

And the model obtained for this case is:

y = -3.4 +5.2 x

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.

And in order to calculate the correlation coefficient we can use this formula:  

r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}  

For this case the value of r = -0.66

Now we can calculate the determination coeffcient:

r^2 = (-0.66)^2 = 0.4356

And then we can conclude that 43.56% of the variation in y can be explained by the explanatory variable

And then 100-43.56 = 56.44 % of the variation in y that cannot be explained by the explanatory variable

8 0
3 years ago
The volume of a room that is 23 feet in W , 10 feet in D, and 8 feet in H is?​
Solnce55 [7]

The volume of the room is: 1840 ft^3

Step-by-step explanation:

The volume is the capacity of a given figure.

Given

Width = w = 23 feet

Depth = d = 10 feet

Height = h = 8 feet

The formula for volume is:

V = W*D*H\\= 23*10*8\\=1840\ ft^3

The volume of the room is: 1840 ft^3

Keywords: Volume, Box

Learn more about volume at:

  • brainly.com/question/2115122
  • brainly.com/question/2116906

#LearnwithBrainly

6 0
4 years ago
I need help on this one, I’ll really appreciate your hard work! :)
Y_Kistochka [10]
I believe it’s 1 lol
5 0
3 years ago
Mrs Katie constructs a cube with 512 magnetic block students and her two classes will each make an identical cube. There are 28
devlian [24]
I take it each student is going to make a block. 
She has 25 + 28 students all together which is 53 students total
Each one requires 512 magnetic blocks

Therefore she needs 53 * 512 = 27136 blocks. 

6 0
3 years ago
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