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3 years ago

What is the sum of two rational numbers?

Mathematics

2 answers:

kogti [31]3 years ago

6 0

The sum of two rational numbers is rational.

Hope it helps!!

ZanzabumX [31]3 years ago

3 0

A rational answer 2 + 2 = 4

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A decreased by the sum of b and c

sergij07 [2.7K]

Answer:

A- (b+ c)

Step-by-step explanation:

A- (b+c)

that's the answer :)

5 0

3 years ago

A certain manufacturing procedure produces items that have a mean weight of 55 pounds and a standard deviation of 3.2 pounds. Wi

Mama L [17]

Answer:

99,7 %

Step-by-step explanation:

P [ 45,4 < X < 64,6 ] ???

P [ 45,4 < X < 64,6 ]

for X = 45,4

z₁ = ( X - μ₀ ) / σ

z₁ = 45,4 - 55 / 3,2

z₁ = - 9,6 / 3,2

z₁ = - 3

And fom z-table we find P [ X = 45,4 ] = 0,0013 or 0,13 %

z₂ = ( 64,6 - 55 )/ 3,2

z₂ = 3

And from z-table we find P [ X = 64,6 ] = 0,9987 or 99,87 %

Then

P [ 45,4 < X < 64,6 ] = 99,87 - 0,13 = 0,9974 or 99,74 %

Now if we look at the values:

μ₀ - 3*σ and μ₀ + 3*σ

we find 55 - 3*3,2 = 55 - 9,6 = 45,4 and 55 + 9,6 = 64,6

We know according to the empirical rule that values from μ₀ ± 3*σ will contains 99,7 % of all values

4 0

3 years ago

15.21 x 0.72 can somebody help its an assignment

NemiM [27]

Answer:

10.9512

Step-by-step explanation:

3 0

2 years ago

Read 2 more answers

BRAINLIEST + POINTS!

sertanlavr [38]

Answer:

the correlation coefficient of the line of best fit is, 0.98247.

Step-by-step explanation:

Correlation Coefficient are used to find how strong relationship between the data. It expressed its values between +1 and -1. It is represented by r.

* if 0<r<1 indicates a strong positive relationship.

* -1<r <0 indicates a strong negative relationship.

* r=0 indicates no relationship at all.

The formula for this :

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

Given the data: (-3, -40) , (1, 12), (5, 72) and (7,137)

Here, n = 4

To calculate the correlation coefficient r;

Substitute the values of data in above formla of r , as shown in the Figure 1:

then;

$r=\frac{4\cdot 1451-(10)(181)}{[4\cdot84-(10)^2][4\cdot 256977 -(181)^2]}$

$r=\frac{5804-1810}{\sqrt{[336-100][102788 -32761]}}=\frac{3994}{\sqrt{[236][70027]}}$

$r=\frac{3994}{4065.26408} =0.98247$

Therefore, the correlation coefficient r is, 0.98247 (Positive relationship)

6 0

3 years ago

A family is going on a 603-mile car trip. So far they have driven 24% of the distance.

devlian [24]

The best eatimated answer would be 150 miles.

24% of 603 = 144.72
so you can round it to 150

7 0

4 years ago

Read 2 more answers