In the United States, the average public school teacher currently earns an annual salary near $55,202. Reported national average
salaries for the last six decades are listed below.
Determine the average mean increase per decade in teachers’ salaries for the six decades, 1960 – 2010.
Determine the average mean increase per decade in teachers’ salaries for the six decades, 1960 – 2010.
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Answer:
Step-by-step explanation:
I assume that the three points given are the vertices of the triangle. So the three points are:
A (-4,1)
B (-7,5)
C (0,1)
The area of a triangle is given by:
where b is the base and h is the height.
Here we can take as follows:
- We can take the base to be the side AC, so that its length is equal to the distance between the two points:
- The height of the triangle is therefore the perpendicular distance between AC and point B. This is equivalent the difference in the x-coordinate between any point on AC and B, so:
Therefore, the area of the triangle is: