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3 years ago

Please help!! (15 points and brainliest)

Mathematics

1 answer:

Ira Lisetskai [31]3 years ago

5 0

The slope is (135 - 15)/(12 - 0) = 120/12 = 10
The slope represents the average monthly cost of gym membership.

The y-intercept is the value of y when x = 0, y-intercept = 15.
The y-intercept represent the the initial membership cost.

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natali 33 [55]

No because the exact opposite of -3 would be 3.

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3 years ago

A criminal has escaped in a train wreck. The police believe he could have traveled no more than 7 mi in any direction from the w

adelina 88 [10]

Answer:

A = 153.94 sq mi

Step-by-step explanation:

In this scenario, we would be starting from the center point and searching the area of a square since the distance in every direction would the same 7 mi. This 7-mile distance would be our radius in this scenario. We now need to use the formula for the Area of a circle to calculate the search area. This formula is the following

A = $\pi r^{2}$

A = $\pi 7^{2}$

A = $\pi 49$

A = 153.94 sq mi

A total of 153.94 square miles must be searched.

5 0

3 years ago

Help me plsss 16,17,18 ;((((

ArbitrLikvidat [17]

Answer:

16. -197 < -110

17. 167 > -65

18. Mercury, Earth, Mars, Jupiter, Uranus, Neptune

Step-by-step explanation:

It can help to plot these temperatures on a number line. The ones farther to the left are less than ones to their right.

16. -197 < -110 . . . Uranus < Jupiter

17. 167 > -65 . . . Mercury > Mars

18. Reading the graph from right to left, the order greatest to least is ...

Mercury, Earth, Mars, Jupiter, Uranus, Neptune

Not surprisingly, this is the order of these planets outward from the sun.

6 0

4 years ago

Length <br> Width <br><br> Pls help me

svetoff [14.1K]

These are the steps needed for this question hope this helps if there is any more questions do feel free to ask them

3 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