I’m sorry I don’t get what your asking.
Your stating if you purchase 20 pens for 55 dollars how much money your making? Why would you be making any money when your buying items and not selling them.
The difference between a blue whale's heart and a African bull elephant heart is 2963.27 lbs. it will take 49 African bull elephant's heart to equal one blue whale's heart.
The average rate of change of the function, over the given interval is 2.
This question is incomplete, the complete question is:
What is the average rate of change of f(x) = 2x+10, if this function interval are x = -3 to x = 0.
<h3>What is the average rate of change over the interval?</h3>
The average rate of change of f(x) over the interval [a,b] is expressed as;

Given that;
- f(x) = 2x + 10
- Interval: [ -3, 0 ], a = -3 and b = 0
We substitute our values into the expression above.
![\frac{f(b)-f(a)}{b-a}\\\\\frac{f(0)-f(-3)}{0-(-3)}\\\\\frac{[2(0)+10]-[2(-3)+10]}{0-(-3)}\\\\\frac{[10]-[-6+10]}{3}\\\\\frac{[10]-[4]}{3}=\frac{6}{3}=2](https://tex.z-dn.net/?f=%5Cfrac%7Bf%28b%29-f%28a%29%7D%7Bb-a%7D%5C%5C%5C%5C%5Cfrac%7Bf%280%29-f%28-3%29%7D%7B0-%28-3%29%7D%5C%5C%5C%5C%5Cfrac%7B%5B2%280%29%2B10%5D-%5B2%28-3%29%2B10%5D%7D%7B0-%28-3%29%7D%5C%5C%5C%5C%5Cfrac%7B%5B10%5D-%5B-6%2B10%5D%7D%7B3%7D%5C%5C%5C%5C%5Cfrac%7B%5B10%5D-%5B4%5D%7D%7B3%7D%3D%5Cfrac%7B6%7D%7B3%7D%3D2)
Therefore, the average rate of change of the function, over the given interval is 2.
Learn more about average rate of change: brainly.com/question/23715190
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Answer:
32.666666666667
http://www.alcula.com/calculators/statistics/mean-absolute-deviation/
Insert data and it will calculate the (MAD).