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3 years ago

How do you represent selling 6 copies as an integer? How do you represent receiving 24 books as an integer?

Mathematics

1 answer:

Sholpan [36]3 years ago

5 0

Answer:

How do you represent selling 6 copies as an integer? With -6

How do you represent receiving 24 books as an integer? With 24.

Step-by-step explanation:

The important thing to state here is what is the thing that you are counting.

If you count the number of copies/books that you have, then:

Selling 6 copies means that you have 6 copies less than before, then you would represent this with a -6.

"-6 copies"

And receiving 24 books means that you have 24 books more than before, then you will represent this with a +24.

"24 books"

(You do not need to write the "+" sign, it is implicit if you don't write any sign)

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Solve the formula for v: A=Z+vg<br> V=

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3 years ago

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3 years ago

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The total cost of the tiles is £68 plus VAT<br>the rate of VAT is 20%<br>(b) work out 20% of £52

MArishka [77]

Answer:

a) 81-6

b) 10.4

Step-by-step explanation:

a) assuming that the VAT is 20% of the 68 pounds,

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= 1,20 * 68 = 81.6 pounds

calculate 20% of 68 pounds and add the answer to 68 pounds:

(0.2 * 68) + 68 = 81.6 pounds

b) 20% of 52

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3 years ago

Assume that a sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given sta

seropon [69]

Answer:

The margin of error is of 0.0184 = 1.84%.

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 level of $1-\alpha$ , 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 $1 - \frac{\alpha}{2}$ .

The margin of error is:

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

95% confidence level

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 question:

$\pi = \frac{1672}{2388} = 0.7, n = 2388$

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

$M = 1.96\sqrt{\frac{0.7*0.3}{2388}}$

$M = 0.0184$

The margin of error is of 0.0184 = 1.84%.

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3 years ago