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Taya2010 [7]
2 years ago
6

PLS HELP ASAP ILL GIVE BRAINLKEST PLS THANKSS

Mathematics
2 answers:
Ilya [14]2 years ago
6 0

Answer:

1. y=x+9

2. y=x+8

zimovet [89]2 years ago
4 0

Answer:

y = x + 9

y = x + 8

Step-by-step explanation:

The line in each graph goes through either 9, -9, 8, or -8 so you know if it is negative or positive and if it is negative I'm pretty sure you do y = x - 9, but if it's a postive you do y = x = 9. (sorry if I'm wrong I haven't done this math in a while)

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What is the value of the correlation coefficient r of the data set?
enyata [817]

The correct option will be:  C) 0.84

<u><em>Explanation</em></u>

Formula for Correlation coefficient :

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

First, for each point(x, y), we need to calculate x², y² and xy .

Then, we will find sum all x, y, x², y² and xy, which gives us Σx, Σy, Σx², ∑y² and Σxy

<em>(Please refer to the attached image for the table )</em>

Here we got, ∑x = 44 , ∑y = 183 , ∑x² = 362 , ∑y² = 6575 and ∑xy = 1480

'n' is the total number of data set, which is 7 here.

So, plugging those values into the above formula..........

r= \frac{n(\Sigma xy)-(\Sigma x)(\Sigma y)}{\sqrt{[n\Sigma x^2-(\Sigma x)^2][n\Sigma y^2-(\Sigma y)^2]}}\\ \\ r=\frac{7(1480)-(44)(183)}{\sqrt{[7(362)-(44)^2][7(6575)-(183)^2]}}\\ \\ r=\frac{10360-8052}{\sqrt{(598)(12536)}}\\ \\ r=\frac{2308}{\sqrt{7496528}}\\ \\ r=0.84

So, the value of the correlation coefficient is 0.84

4 0
3 years ago
Read 2 more answers
Dana is planning to drive 400 miles from
GaryK [48]

Answer:

A. 8 gallons

B. Drive by car is $59.4 cheaper than travel by train

Step-by-step explanation:

According to the scenario, given data are as follows,

Total drive = 400 miles

Total drive per gallon = 50 miles

Fuel cost per gallon = $4.45

A. So, Total fuel required to drive 400 miles can be calculated as follows,

Total fuel required =  Total drive ÷ Total drive per gallon

By putting value, we get,

Total fuel required = 400 ÷ 50

= 8 gallons

B. Total cost if drive by car = 8 gallons × $4.45 = $35.6

Cost if travel by train = $95

Hence it is clearly shows that drive by car is much cheaper than travel by train.

Cost saved by travel by car = $95 - $35.6 = $59.4

So, drive by car is $59.4 cheaper than travel by train.

5 0
3 years ago
Can someone please help me with this question?! (geometry)
garri49 [273]
The awnser would be a because the cylinders have the same size which means they have the same volume
3 0
3 years ago
20 POINTS!!!!!
Alexus [3.1K]

Answer:

Step-by-step explanation:

It was 12 take away 210 add 20 to 3243

7 0
2 years ago
Read 2 more answers
The perimeter of an airplane ticket is 32 centimeters. The area is 60 square centimeters. What are the dimensions of the ticket
victus00 [196]
We model the ticket as a rectangle.
 For this case what you should know is that the perimeter of the rectangle is given by:
 P = 2w + 2l
 The area of the rectangle is given by:
 A = w * l
 In both cases:
 w: width
 l: long
 We have the following system of equations:
 32 = 2w + 2l
 60 = w * l
 Solving the system we obtain:
 The dimensions of the ticket are:
 (10 cm) * (6 cm)
 Answer:
 the dimensions of the ticket are:
 (10 cm) * (6 cm)
 Note: see attached image for system solution

8 0
2 years ago
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