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2 years ago

Let a and b be rational numbers. Is a – b rational or irrational?

Mathematics

1 answer:

topjm [15]2 years ago

7 0

Answer:

Rational

Step-by-step explanation:

Since a and b are rational, a - b has to be rational because we are not dividing them. 2 rational numbers subtracted from each other is always a rational number.

Example: 34 (rational) 23 (rational)

34 - 23 = 11 (rational)

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What is the solution to the equation 6x+2=9x-1?<br> 0 0 0 0<br> X= 1

Stells [14]

Answer:

Step-by-step explanation:

6x+2=9x-1 x=1

6(1)+2=9(1)-1

6+2=9-1

8=8

Hope this helps :)

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2 years ago

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A study of recent records of car accidents revealed that average proportion of drivers who were distracted by their phones at th

aksik [14]

Answer:

At least 547 records need to be studied.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence interval $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

Z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

And the margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

95% confidence interval

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $z = 1.96$ .

In this problem, we have that:

$M = 0.04, p = 0.35$

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.04 = 1.96\sqrt{\frac{0.35*0.65}{n}}$

$0.04\sqrt{n} = 0.93486$

$\sqrt{n} = 23.37$

$n = 546.2275$

At least 547 records need to be studied.

6 0

2 years ago

What’s the answer??????

Fofino [41]

Answer:

2x=34+56

x=90÷2

therefore x=45

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2 years ago

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Could someone help me with this im so confused

Arlecino [84]

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1 year ago

Can someone help me with this please?

photoshop1234 [79]

Your answer is B ...

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1 year ago