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LenKa [72]
2 years ago
9

Shopping for a freezer, Manuit finally settled on one with a purchase price of $850. The annual cost of operating the freezer is

$40 per year. When Manuit's average cost of owning the freezer is less than $117, he plans to shop for a new freezer. When can Manuit shop for a new freezer?
Mathematics
1 answer:
MatroZZZ [7]2 years ago
3 0

Answer:

In 12 months

Step-by-step explanation:

Let a = year when average the average cost of owning a freezer would be less than $117

($850 + $40a) / a < $117

$850 + $40a < $117a

collecting like terms

$850 < $77a

a = 11.04 months

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frutty [35]

Answer:

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r =0.934

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We can also find the r^2 who represent the determination coefficient and we got:

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Step-by-step explanation:

Previous concepts

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]}}  

The correlation coeffcient for this case was provided:

r =0.934

And this coefficient is very near to 1 the maximum possible value, so then we can interpret that the relationship between the entrace exam score and the grade point average are strongly linearly correlated .

We can also find the r^2 who represent the determination coefficient and we got:

r^2 = 0.934^2= 0.872

And the interpretation for this is that a linear model explains appproximately 87.2% of the variability between the two variables

8 0
1 year ago
Rip van Winkle fell asleep for a very long time. When he fell asleep, his beard was 8 millimeters long, and each passing week it
S_A_V [24]

Answer:

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Step-by-step explanation:

L(w) = length of beard as a function of time in weeks

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7 0
1 year ago
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Musya8 [376]

Answer:

D

Step-by-step explanation:

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where (h, k) are the coordinates of the centre and r is the radius

Here (h, k ) = (2, 3 ) and r = 6, thus

(x - 2)² + (y - 3)² = 6², that is

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3 0
2 years ago
∆ABC and ∆PQR are similar. ∆ABC is dilated by a scale factor of 1.25 and rotated 45° counterclockwise about point B to form ∆PQR
Andrej [43]
This is the concept of transformation of figures, given that ΔABC is similar to ΔPQR, the sides of ABC are 5 units, 4.2 units and 4 units. Since the two triangles are similar and PQR is the image of ABC under the dilation 1.25, the sides of PQR will be:
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7 0
2 years ago
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joja [24]

Answer:

Step-by-step explanation:

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Hope this helps

4 0
2 years ago
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