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3 years ago

What are numbers that are either whole numbers or negatives of whole numbers

Mathematics

2 answers:

leonid [27]3 years ago

8 0

These are called integer numbers.

We start with natural numbers (or whole numbers), i.e. the set

$\mathbb{N} = \{0,1,2,3,4,\ldots\}$

When you add the opposite of each whole number, you have the set of integers:

$\mathbb{Z} = \{0,\pm1,\pm2,\pm3,\ldots\}$

earnstyle [38]3 years ago

6 0

Answer:the not called whole numbers there called integers

Step-by-step explanation: whole numbers are 0 1 2 3 4 and so on integers are 0 -1 -2 -3 -4 and so on

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A doctor at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she

Nataly_w [17]

Answer:

The minimum sample size needed is $n = (\frac{1.96\sqrt{\sigma}}{4})^2$ . If n is a decimal number, it is rounded up to the next integer. $\sigma$ is the standard deviation of the population.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.9}{2} = 0.05$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.05 = 0.95$ , so Z = 1.645.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

How large a sample must she select if she desires to be 90% confident that her estimate is within 4 ounces of the true mean?

A sample of n is needed, and n is found when M = 4. So

$M = z\frac{\sigma}{\sqrt{n}}$

$4 = 1.96\frac{\sigma}{\sqrt{n}}$

$4\sqrt{n} = 1.96\sqrt{\sigma}$

$\sqrt{n} = \frac{1.96\sqrt{\sigma}}{4}$

$(\sqrt{n})^2 = (\frac{1.96\sqrt{\sigma}}{4})^2$

$n = (\frac{1.96\sqrt{\sigma}}{4})^2$

The minimum sample size needed is $n = (\frac{1.96\sqrt{\sigma}}{4})^2$ . If n is a decimal number, it is rounded up to the next integer. $\sigma$ is the standard deviation of the population.

4 0

3 years ago

A regular polygon is inscribed in a circle of radius 11 cm. Calculate the perimeter of the polygon to the nearest tenth if the p

Oduvanchick [21]

I believe the answer is 176cm cause if the radius is 11 the diameter is 22 so I hope this helps!

7 0

3 years ago

Mike discovered that the pool in his backyard is leaking slowly. The pool holds 15,434 gallons of water, and is leaking at a rat

Usimov [2.4K]

Answer:

12, 994 gallons

Step-by-step explanation:

20(122) = 2440

15434 - 2440 = 12, 994

7 0

3 years ago

Ryan decided to ride his bicycle X times around the neighborhood. His best friend

WITCHER [35]

5x + 8

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3 years ago

1) What is the surface area? 1 ft 8 ft 4 ft

WITCHER [35]

Answer:

88 ft^2

Step-by-step explanation:

For a rectangular prism with dimensions 1 ft by 8 ft by 4 ft, there are two opposite faces with dimensions

1 ft by 8 ft,

two opposite faces with dimensions

1 ft by 4 ft,

and two opposite faces with dimensions

4 ft by 8 ft.

We find their area and add them.

SA = 2 * 1 ft * 8 ft + 2 * 1 ft * 4 ft + 2 * 4 ft * 8 ft

SA = 16 ft^2 + 8 ft^2 + 64 ft^2

SA = 88 ft^2

5 0

3 years ago