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370.75 ~ 371
Example:
To find the average for 10,18 and 13.
We just have add the following numbers and divided them by how many numbers you added.
Solution:
10 + 18 + 13 = 41
41 / 3 = 13.67 or 14
Then the average score is 14.
Measures of central tendency are a statistical method in which you measure and gather the middlemost value of the set of parameters.
1. Median
2. Mode
<span>3. Mean, this is considered to be the average in lay man's term.<span>
</span></span>
She made the mistake of grouping unlike terms and factorizing.
Given that
Helene is finding the sum (9 + 10i) + (–8 + 11i).
She rewrites the sum as (–8 + 11)i + (9 + 10)i.
We have to determine
Which statement explains the property of addition that she made an error in using?
According to the question
The mistake she did is in the second term distributing.
(9+10i) is not equal to (9+10)i
Similarly (-8+11i) is not equal to (-8+11)i.
The correct method she should have done is given below;
Grouping real terms together and imaginary terms together and finding the sum is,

Hence, she made the mistake of grouping unlike terms and factorizing.
To know more about Complex Number click the link given below.
brainly.com/question/10078818
Answer:
and 
Step-by-step explanation:
The first system is
and 
We substitute x=-3 and y=-3
and 
Both equations are not satisfied
The next system is
and 
We substitute x=-3 and y=-3
and 
Both equations are satisfied
The next system is
and 
We substitute x=-3 and y=-3
and 
Both equations are not satisfied
The next system is
and 
We substitute x=-3 and y=-3
and 
Both equations are not satisfied
The length of line segment AB by observation if the diagram in the task content is; 14.
<h3>
What is the length of line segment AB?</h3>
It follows from the task content that the line segment MN can be considered as parallel to line segment AB. This follows from the fact that the vertices of triangle MNO are midpoints of the line segments of triangle ABC.
Consequently, it can be concluded that line segment AB is twice the length of line segment MN and hence, BC = 2 × 7 = 14.
Read more on triangle line segments;
brainly.com/question/3573606
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