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2 years ago

2 rational numbers who’s difference is rational

Mathematics

1 answer:

horrorfan [7]2 years ago

6 0

Answer: (5+√2) and (3+√2)

Step-by-step explanation: Let (5+√2) and (3+√2) be two irrational numbers

Difference = (5+√2) - (3+√2)

Difference = 2

2 is a rational number

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In order to determine an interval for the mean of a population with unknown standard deviation, a sample of 24 items is selected

nikitadnepr [17]

If the sample size of population is 24 then the number of degrees of freedom for reading the t value is 23 which is option c.

Given sample size of 24,mean 23.

We have to determine the number of degrees of freedom which will be used to find the critical values of t.

Degree of freedom is the number of values in the final calculation of a statistic that are free to vary means that can change their values in the formula of calculating t.

t=(X-μ)/s/ $\sqrt{n}$

where X is sample mean ,

μ is hypothsised population mean

s is sample standard deviation

n is sample size.

Degree of freedom=n-1

In this question n is 24 so the degree of freedom =24-1=23.

Hence the number of degrees of freedom for reading the t value is 23.

Learn more about degree of freedom at brainly.com/question/17305237

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1 year ago

2x-4<br> 30<br> 15x - 30<br> PAP

Alex787 [66]

Answer:

$\frac{2}{25}$

Step-by-step explanation:

Given expression,

$\frac{\frac{2x-4}{30} }{\frac{15x-30}{18} }$

=> $\frac{\frac{2(x-2)}{30} }{\frac{15(x-2)}{18} }$

We see that $(x-2)$ is common in both numerator and denominator

hence canceling out we get:-

$\frac{2*18}{30*15}=\frac{2}{25}$

Answer= $\frac{2}{25}$

4 0

2 years ago

In 2011, it was estimated that the number of U.S households which had dogs as pets was 4.33 x 10^7 and the average number of dog

poizon [28]

The right answer is

D. 6.93 X 10^7

4 0

3 years ago

Pls Help!!! 50 points!!!<br> Question in picture

Leya [2.2K]

Answer:

I'm not pretty sure but I think is the second option, B

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2 years ago

Straight-Line Depreciation A small delivery truck was purchased on January 1 at a cost of $21,920. It has an estimated useful li

lesantik [10]

Answer:

Rate of depreciation per year is 4310 $/ year and the depreciation schedule is given below.

Step-by-step explanation:

According to the question,

since, it is straight-line depreciation,

rate of depreciation per year = $\frac{21920 - 4680}{4}$ $/year

= 4310 $/ year

So we can prepare the following table. (year = 0 for the base period)

Year Depreciation Accumulated Book value

expense depreciation

( in $) (in $) (in $)

0 0 0 21920

1 4310 4310 17610

2 4310 8620 13300

3 4310 12930 8990

4 4310 17240 4680

6 0

2 years ago