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Elis [28]
2 years ago
11

I’ll mark as brainliest if someone can help me!!

Mathematics
2 answers:
yawa3891 [41]2 years ago
8 0

Answer:

The answer is B

Step-by-step explanation:

because it snows 4 more time

if 30mins is 7/8 then 3

more of that is 4 times

REY [17]2 years ago
5 0

Answer:

The answer is B.

Step-by-step explanation:

So you have to multiply it by 2 by 7/8, but that isn't an option. So... You have to double the amount to multiply it if you are going to decrease the amount of the fraction. Ex: 4 x 7/4

HOPE THIS HELPS!!! PLEASE GIVE BRAINLIEST!!!

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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

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2 years ago
Samantha wants to move into an apartment when she begins school in the fall. Right now she
kompoz [17]

Answer:

she should set up a budget on how much she makes

Step-by-step explanation:

4 0
2 years ago
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Find the value of the lesser root of x2 + 12x + 35 = 0.
matrenka [14]
In quadratic equations,
                                   a + b = -B
                                      ab = C
where a and b are the roots, B is the second term, and C is the constant.
Substituting,
                                  a + b = -12
                                      ab = 35
The values of a and b from the equation is -7 and -5. Thus, the lesser root is -7. 
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You purchase a $120 jacket that is on sale for 20% off. How much do you pay for the jacket?
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Answer:

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Step-by-step explanation:

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The answer is :536000
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