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3 years ago

What are the factors of 21?

Mathematics

1 answer:

Genrish500 [490]3 years ago

3 0

The factors 1 ,3 ,7 ,21

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536-248 answer and show your work

Anni [7]

Answer:

288

Step-by-step explanation:

288+248=536

8 0

2 years ago

What conclusion can be determined from the dot plot below? pls help :,D

Amiraneli [1.4K]

Answer:

Step-by-step explanation:

the others are wrong

4 0

3 years ago

A school bus has 25 seats, with 5 rows of 5 seats. 15 students from the first grade and 5 students from the second grade travel

Serjik [45]

The answer is B. 5P5 x 20P15.

This is because to make the second grade students to sit in the first row we have 5 seats and 5 students so we will permute the 5 students to those 5 seats. So 5P5.

Now we are left with 20 seats and 15 first grade students so we can simply permute those 15 students into those 20 seats. So 20P15.

Finally using the counting rule principle we will multiply both of these so 5P5 x 20P15.

7 0

3 years ago

Read 2 more answers

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

Anon25 [30]

Answer: 18

Step-by-step explanation:

Given : Margin of error = 3 ounces

Significance level : $\alpha = 1-0.99=0.1$

Critical value : $z_{\alpha/2}=2.576$

Standard deviation : $\sigma=5\text{ ounces}$

The formula to calculate the sample size is given by :-

$n=(\dfrac{z_{\alpha/2}\ \sigma}{E})^2$

$\Rightarrow\ n=(\dfrac{2.576\times5}{3})^2\\\\\Rightarrow\ n=18.4327111111\approx18$

Hence, the minimum sample size should be 18.

3 0

3 years ago

It took Lou 2 1/2 gallons of paint to paint one fence. How many gallons to paint six fences that are small in size

rusak2 [61]

Answer:

15 gallons to paint six fences that are small in size.

Step-by-step explanation:

Unit rate defined as the rates are expressed as a quantity 1 such as 3 miles per hour or 5 meter per seconds.

As per the statement:

It took Lou $2\frac{1}{2}$ gallons of paint to paint one fence.

$\text{Unit rate per fence}= \frac{\text{Number of gallons of paint}}{\text{number of fences}}$

Substitute the given value we have;

$\text{Unit rate per fence}= \frac{\frac{5}{2} }{1} = \frac{5}{2}$ gallons.

We have to find how many gallons to paint six fences that are small in size.

By definition of unit rate;

$\text{Number of gallons to paint 6 fences}= \text{Unit rate per fence} \times 6$

Substitute the given values we have;

$\text{Number of gallons to paint 6 fences}= \frac{5}{2} \times 6 = 5 \times 3 = 15$

Therefore, 15 gallons to paint six fences that are small in size.

3 0

3 years ago