Give an example of a system that has no solutions

Mathematics

1 answer:

Anna11 [10]4 years ago

5 0

Answer:

|3+x|=-3

Step-by-step explanation:

This equation has no solution because the answer would be - x=-3 X can't be negative 3 because if we inputed -3 into the absolute value, it wouldn't make any sense, as the absolute value of -3 is +3

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What is 6/13 in short decimal form.

elena55 [62]

I think I'll be 6/13= 0.4615

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4 years ago

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Are these ratios equivalent?<br><br> 10 friends to 12 strangers<br><br> 30 friends to 36 stranger

horrorfan [7]

Answer:

Yes

Step-by-step explanation:

10:12 and 30:36

you can simplify them first so

10:12=5:6

and

30:36=5:6 which is equivalent to the other ratio

or you can do

10:12

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A credit card company is about to send out a mailing to test the market for a new credit card. From that sample, they want to es

Sergeeva-Olga [200]

Answer:

$n=\frac{0.005(1-0.005)}{(\frac{0.001}{1.96})^2}=19111.96$

And rounded up we have that n=19112

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Solution to the problem

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by: