4 years ago

How to solve sets in mathematics

1 answer:

5 0

Answer:

Sets, in mathematics, are an organized collection of objects and can be represented in set-builder form or roster form. Usually, sets are represented in curly braces {},

For example, A = {1,2,3,4} is a set.

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The sum of the two digits of a number is 9. If the tens digit is one-half the units digit, what is the number? Let t = the tens

soldi70 [24.7K]

The second condition tells you that $t$ is half the size of $u$ , so $t=\dfrac12u$ , which could be rewritten in several ways. In standard form, that would be $2t-u=0$ .

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4 years ago

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0 divided by 0 is? 45 points for who answer its correct not for a homework

Elenna [48]

Answer:

Undefined

Step-by-step explanation:

No multiplicative inverse exists for 0

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2 years ago

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6. Rosanne is selling her Corvette. She wants to include a photo of her

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add them

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2 years ago

In a recent study of 42 eighth graders, the mean number of hours per week that they watched television was 19.6. Assume the popu

olya-2409 [2.1K]

Answer:

$19.6-2.42\frac{5.8}{\sqrt{42}}=17.43$

$19.6+2.42\frac{5.8}{\sqrt{42}}=21.77$

And the best option for this case would be:

a. (17.5, 21.7)

Step-by-step explanation:

Information given

$\bar X= 19.6$ represent the sample mean

$\mu$ population mean

$\sigma= 5.8$ represent the population deviation

n=42 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The degrees of freedom, given by:

$df=n-1=42-1=41$

Since the Confidence is 0.98 or 98%, the significance would be $\alpha=0.02$ and $\alpha/2 =0.1$ , and the critical value would be $t_{\alpha/2}=2.42$