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3 years ago

What is the difference between 6z and z6

Mathematics

2 answers:

I am Lyosha [343]3 years ago

4 0

Since multiplication is dissolved in both monomials, there is no difference.

ValentinkaMS [17]3 years ago

3 0

6z - z^6

Since we don't have the value for z, we cannot solve the expression, however, we can get out most simple expression.

Answer: 5z^6

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Splve for a. help me please

Papessa [141]

2a+7=180-109

2a+7=71

-7=71-7

2a=64

a/2=64/2

a=32

8 0

2 years ago

Which is the graph of the inequality y ≥ 2x + 3

Charra [1.4K]

It's B, remember when you have _ ( referring to =) you have straight line, but when it's just < or > you have dotted line

7 0

2 years ago

120% of a number is 45 find the number

Bezzdna [24]

Hello,

Here is your answer:

The proper answer to this question is "37.5".

Your answer is 37.5!

If you need anymore help feel free to ask me!

Hope this helps!

3 0

2 years ago

In an examination of purchasing patterns of shoppers, a sample of 16 shoppers revealed that they spent, on average, $54 per hour

Lesechka [4]

Answer:

$54-1.64\frac{21}{\sqrt{16}}=45.39$

$54 +1.64\frac{21}{\sqrt{16}}=62.61$

So on this case the 90% confidence interval would be given by (45.39;62.61)

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".

$\bar X=54$ represent the sample mean

$\mu$ population mean (variable of interest)

$\sigma=21$ represent the sample standard deviation

n=16 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 $\alpha=1-0.9=0.1$ and $\alpha/2 =0.05$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.05,0,1)".And we see that $z_{\alpha/2}=1.64$