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3 years ago

What is 2a+a+2a+a ????

2 answers:

8 0

Hello there!

Whenever you see a variable (letter) without a number in front of it, the "number" would be 1!

Example:

a = 1a

So simply do basic math! For now, ignore the letters!

2a + a + 2a + a

becomes

2 + 1 + 2 + 1

Once you have your answer, simply add an a to the end!

Your answer will have NO exponents because you're adding! If you were multiplying or dividing the variables, then exponents would be an issue.

Hope this helped! :)

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koban [17]3 years ago

7 0

Just combine like terms

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An article costing Gh37000 was sold for Gh31450. What is the loss percent

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Answer:

15%

Step-by-step explanation:

The first step is to find the loss

Cost price -selling price

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3 years ago

The U.S. Census Bureau conducts a study to determine the time needed to complete the short form. The Bureau surveys 200 people.

NISA [10]

Answer:

$8.2-2.58\frac{2.2}{\sqrt{18}}=6.86$

$8.2+2.58\frac{2.2}{\sqrt{18}}=9.54$

So on this case the 90% confidence interval would be given by (6.86;9.54) And the error is given by:

$ME= 2.58\frac{2.2}{\sqrt{18}} =1.338$

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".

$\bar X=8.2$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=2.2$ represent the population standard deviation

n represent the sample size

Solution to the problem

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

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

Since the Confidence is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.005$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.005,0,1)".And we see that $z_{\alpha/2}=2.58$