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rosijanka [135]
3 years ago
10

Which two terms can be combined in this expression?

Mathematics
2 answers:
Zanzabum3 years ago
8 0

Answer:

Option (b) is correct.

we can combine 3.2m and -\frac{m}{5}

Step-by-step explanation:

Consider the given expression, 6+3.2m+\frac{2}{5}n-\frac{m}{5}

WE have to find the two terms can be combined in this expression.

We can combine those term which have same variable with same degree.

Here, since degree of each variable is 1 and contain two variables m and n.

So we can combine m terms together.

As , 6+3.2m+\frac{2}{5}n-\frac{m}{5}=6+(3.2-\frac{1}{5})m+\frac{2}{5}n

Thus, we can combine 3.2m and -\frac{m}{5}

Option (b) is correct.

Degger [83]3 years ago
4 0
The second option given
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sertanlavr [38]

Answer:

the correlation coefficient of the line of best fit  is, 0.98247.

Step-by-step explanation:

Correlation Coefficient are used to find how strong relationship between the data. It expressed its values between +1 and -1. It is represented by r.

* if 0<r<1 indicates a strong positive relationship.

* -1<r <0 indicates a strong negative relationship.

* r=0 indicates no relationship at all.

The formula for this :

r = \frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2-(\sum x)^2][n\sum y^2-(\sum y)^2]}}

Given the data: (-3, -40) , (1, 12), (5, 72) and (7,137)

Here, n = 4

To calculate the correlation coefficient r;

Substitute the values of data in above formla of r , as shown in the Figure 1:  

then;                  

r=\frac{4\cdot 1451-(10)(181)}{[4\cdot84-(10)^2][4\cdot 256977 -(181)^2]}

or    

r=\frac{5804-1810}{\sqrt{[336-100][102788 -32761]}}=\frac{3994}{\sqrt{[236][70027]}}

or

r=\frac{3994}{4065.26408} =0.98247

Therefore, the correlation coefficient r is, 0.98247 (Positive relationship)


6 0
3 years ago
How to solve a system of equations using elimination
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3 years ago
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NikAS [45]
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3 0
3 years ago
1. Which of the following steps are necessary to solve a quadratic equation of the form az? + bz+c=0 by factoring? Select all th
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Answer:

A.)

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Step-by-step explanation:

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6 0
3 years ago
On a map, 1 inch represents 20 miles. The distance between two towns is 6 whole number 1/5 inches. How many miles are actually b
ValentinkaMS [17]

Answer:

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Step-by-step explanation:

From the question given above, the following data were obtained:

1 in = 20 miles

6 1/5 in =?

Next, we shall express 6 1/5 in decimal for easy calculation . This can be obtained as follow:

6 1/5 = 31 / 5

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3 0
3 years ago
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