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3 years ago

Question 2

Mathematics

1 answer:

Colt1911 [192]3 years ago

6 0

Step-by-step explanation:

The degree of the polynomial is 4.

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A water molecule is formed from two hydrogen atoms and one oxygen atom, Fill in the table for 2,5,10 and 20 water molecules (sor

blagie [28]

Water |2|5 |10|20
Hydrogen |4|10|20|40
Oxygen |2|5 |10|20

I guess this is what the question means

8 0

3 years ago

A test is worth 75 points. Multiple-choice questions are worth 2 points and

Likurg_2 [28]

Answer:

D. m+s=30

2m+3s=75

Step-by-step explanation:

let m be the no of multiple choice questions and s be the short questions then there are a total of 30 questions

m+s=30------A

there are 2 points for m(multiple choice questions) and 3 points for short questions (s) and totalling to 75

2m+ 3s=75

7 0

3 years ago

The number of motor vehicles registered in millions in the US has grown as follows:

zysi [14]

Answer:

a) Figure attached

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

For our case we have this:

n=10 $\sum x = 75.819, \sum y = 43.5231, \sum xy = 330.0321, \sum x^2 =574.8598, \sum y^2 =192.8274$

$r=\frac{10(330.0321)-(75.81948)(43.5231)}{\sqrt{[10(574.8598) -(75.819)^2][10(192.8274) -(43.5231)^2]}}=0.989$

So then the correlation coefficient would be r =0.989

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.

Solution to the problem

Part a

Year (x): 1940, 1945 1950, 1955, 1960, 1965, 1970, 1975, 1980, 1985

Vehicles (Y): 32.4, 31.0, 49.2, 62.7, 73.9, 90.4, 108.4, 132.9, 155.8, 171.7

After apply natural log for the two variables and create the scatterplot in excel we got the following result on the figure attached.

Part b

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 our case we have this:

n=10 $\sum x = 75.819, \sum y = 43.5231, \sum xy = 330.0321, \sum x^2 =574.8598, \sum y^2 =192.8274$

$r=\frac{10(330.0321)-(75.81948)(43.5231)}{\sqrt{[10(574.8598) -(75.81948)^2][10(192.8274) -(43.5231)^2]}}=0.989$

So then the correlation coefficient would be r =0.989

4 0

3 years ago

Triangle PQR is transformed to similar triangle P′Q′R′ below:

morpeh [17]

1 over 3 should be the answer I think

6 0

3 years ago

Deshawn fuels 2 yachts and 6 barges. Each boat gets 126 gallons of fuel. To find out how much fuel he needs for all boats, desha

Maslowich

Since there are 8 boats (2 yachts + 6 barges) the three partial products would be as follows:
100 * 8
20 * 8
6 * 8
These are from taking the gallons of fuel for each boat that are needed and breaking it into the place values.
(100*8) + (20* 8) + (6*8) =
800+160+48=
1008 gallons of fuel are needed.

Read more on Brainly.com - brainly.com/question/5990003#readmore

5 0

3 years ago