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3 years ago

What is a factor for -20?

Mathematics

2 answers:

liubo4ka [24]3 years ago

6 0

Answer:

factors are 2 and 5.

Step-by-step explanation:

Factors are numbers which you can multiply together to get another number. For Example : The numbers 2 and 3 are factors of 6 because 2 x 3 = 6. A number can have many factors! Example : 2 and 4 are factors of 8, because 4 x 2 = 8. Also 1 and 8 can also be factors of 8, because 1 x 8 = 8.

on prime factorization, we get the factors of 20 as,

2 x 2 x 5 = 20.

Essentially, to factor a negative number, find all of its positive factors, then duplicate them and write a negative sign in front of the duplicates. For instance, the positive factors of −3 are 1 and 3.

-2 x 2 x 5 = -20

2 x 2 x -5 = -20

Elena L [17]3 years ago

4 0

Answer:

1 ,2,4,5,10,-1,-2,-4,-5,-10,20

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A researcher takes a simple random sample of 83 homes in a city and finds that the mean square footage is 1628 with a standard d

Anna [14]

Answer: (1583.63, 1672.37)

Step-by-step explanation:

Given : Sample size : n= 83

Sample mean : $\overline{x}=1628$

Sample standard deviation : $\sigma=243$

The population standard deviation $(\sigma)$ is unknown .

The confidence interval for population mean :

$\overline{x}\pm t_{\alpha/2}\dfrac{s}{\sqrt{n}}$

For 90% confidence , significance level = $\alpha=1-0.90=0.10$

Using t-distribution table , Critical t-value = $t_{(\alpha/2, n-1)}=t_{0.05,82}=1.6636$

, where n-1 is the degree of freedom.

Now , 90% confidence interval for the mean square footage of all the homes in that city will be :-

$1628\pm (1.6636)\dfrac{243}{\sqrt{83}}\\\\ 1628\pm (1.6636)(26.672715)\\\\\\\\\approx1628\pm 44.37\\\\=(1628- 44.37,\ 1628+ 44.37)\\\\=(1583.63,\ 1672.37)$

Hence, the 90% confidence interval for the mean square footage of all the homes in that city = (1583.63, 1672.37)

7 0

3 years ago

A bicycle training wheel has a radius of 3 inches. The bicycle wheel has a radius of 10 inches.Approximately how much smaller, i

choli [55]

Answer:

Area of training wheel is 285.74 square inches smaller than bicycle wheel.

Step-by-step explanation:

Given : A bicycle training wheel has a radius of 3 inches. The bicycle wheel has a radius of 10 inches.

To find : How much is the the area of the training wheel than the area of the regular wheel?

Solution :

→A bicycle training wheel has a radius of 3 inches.

Area of of the training wheel is $A=\pi r^2$

where r is the radius and r=3 inches (given), $\pi =3.14$

$A_1=\pi r^2$

$A_1=(3.14) (3)^2$

$A_1=3.14\times9$

$A_1=28.26 inches^2$

Area of the bicycle training is 28.26 square inches.

→ The bicycle wheel has a radius of 10 inches.

Area of of the bicycle wheel is $A=\pi r^2$

where r is the radius and r=10 inches (given), $\pi =3.14$

$A_2=\pi r^2$

$A_2=(3.14) (10)^2$

$A_2=3.14\times100$

$A_2=314 inches^2$

Area of the bicycle wheel is 314 square inches.

The area of the training wheel than the area of the regular wheel is

$Area=314-28.26=285.74$

Rounded to nearest hundredth the area is 285.74 square inches.

Therefore, Area of training wheel is 285.74 square inches smaller than bicycle wheel.

5 0

3 years ago

4. Each pail of plaster covers 90 square feet of ceiling. What is the least number of pails of plaster you would need to buy to

alekssr [168]

Answer d: 3 pails

The area of the ceiling:
A = 142 = 196 f2
We need plaster to cover 196 $2
196: 90 = 2.17778
Answer: We have to buy 3 pails of plaster

7 0

3 years ago

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Consider the relation y = −4|x − 5| + 3. Which of the following best describes the minimum or maximum point of this relation?

Sauron [17]

Second choice: Maximum at (5,3)

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4 years ago

What is the cubic root of 81 without a calculator? And how do you get it? Please explain

Schach [20]

Answer:

$3\sqrt[3]{3}$