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lesya692 [45]
2 years ago
10

What is the gcf of 18a and 20ab

Mathematics
2 answers:
oksian1 [2.3K]2 years ago
7 0

Answer:

2

Step-by-step explanation:

the biggest number they can both divide by is 2.

ohaa [14]2 years ago
4 0

Answer:

It is 2a

Step-by-step explanation:

Ok the greatest common factor is the number and/or term common to a seri3s of values so you separate them

the GCF of 18 and 20 is 2

and you also have a and ab

now, what is common to them both

a

<em><u>s</u></em><em><u>o</u></em><em><u> </u></em><em><u>y</u></em><em><u>o</u></em><em><u>u</u></em><em><u> </u></em><em><u>w</u></em><em><u>o</u></em><em><u>u</u></em><em><u>l</u></em><em><u>d</u></em><em><u> </u></em><em><u>g</u></em><em><u>e</u></em><em><u>t</u></em><em><u> </u></em><em><u>t</u></em><em><u>h</u></em><em><u>e</u></em><em><u> </u></em><em><u>gcf</u></em><em><u> </u></em><em><u>a</u></em><em><u>s</u></em><em><u> </u></em><em><u>2</u></em><em><u>a</u></em><em><u> </u></em><em><u>s</u></em><em><u>o</u></em><em><u> </u></em><em><u>i</u></em><em><u>t</u></em><em><u> </u></em><em><u>w</u></em><em><u>ould</u></em><em><u> </u></em><em><u>b</u></em><em><u>e</u></em><em><u> </u></em><em><u>w</u></em><em><u>r</u></em><em><u>i</u></em><em><u>t</u></em><em><u>t</u></em><em><u>e</u></em><em><u>n</u></em><em><u> </u></em><em><u>a</u></em><em><u>s</u></em><em><u> </u></em><em><u>2</u></em><em><u>a</u></em><em><u>(</u></em><em><u>9</u></em><em><u>+</u></em><em><u>1</u></em><em><u>0</u></em><em><u>b</u></em><em><u>)</u></em>

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Answer:

y=1.25x

Step-by-step explanation:

Let us assume that,

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Here, the rate of change is 1.25. So for each increase in x, the amount of increase in y is 1.25

The table along with the graph have been attached below.

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Liam biked for 3 hours at a speed of 8 mph and then walked the remaining part of his way at a speed of 3 mph. If the total dista
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2. In your own words, explain HOW to find the standard deviation of this data set. (20 points) 3. What does the standard deviati
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Answer:

\sigma = 11.28 --- Standard deviation

Step-by-step explanation:

Given

See attachment for graph

Solving (a): Explain how the standard deviation is calculated.

<u>Start by calculating the mean</u>

To do this, we divide the sum of the products of grade and number of students by the total number of students;

i.e.

\bar x = \frac{\sum fx}{\sum f}

So, we have:

\bar x = \frac{50 * 1 + 57 * 2 + 60 * 4 + 65 * 3 +72 *3 + 75 * 12 + 77 * 10 + 81 * 6 + 83 * 6 + 88 * 9 + 90 * 12 + 92 * 12 +95 * 2 + 99 * 4 + 100 * 5}{1 + 2 + 4 + 3 +3 + 12 + 10 + 6 + 6 + 9 + 12 + 12 +2 + 4 + 5}

\bar x = \frac{7531}{91}

\bar x = 82.76

Next, calculate the variance using the following formula:

\sigma^2 = \frac{\sum f(x - \bar x)^2}{\sum f}

i.e subtract the mean from each dataset; take the squares; add up the squares; then divide the sum by the number of dataset

So, we have:

\sigma^2 = \frac{1 * (50 - 82.76)^2 +...................+ 5 * (100 - 82.76)^2}{91}

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Lastly, take the square root of the variance to get the standard deviation

\sigma = \sqrt{\sigma^2}

\sigma = \sqrt{127.26}

\sigma = 11.28 --- approximated

<em>Hence, the standard deviation is approximately 11.28</em>

Considering the calculated mean (i.e. 82.76), the standard deviation (i.e. 11.28) is small and this means that the grade of the students are close to the average grade.

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