This is done with a process of limits. Average rate of change is, for example, (change of y) / (change of x). If you make "change of x" smaller and smaller, in theory (with certain assumptions, a bit too technical to mention here), you get closer and closer to the instant rate of change. In the "limit", when "change of x" approaches zero, you get the true instantaneous rate of change.
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The instantaneous rate of change is the limiting value of the average change as the time period is made smaller and smaller.
If you find the common denominator for the fractions, then the bottom will stay the same :) BUT sometimes it is diffacult to find the common denominator so you may need help
The average of 100 and 53 is 76.5.
The slope can help you find the y intercept of a line, as well as many other coordinates.
This question was assigned to help you discover whether you know what "average" means, and how to use it. Sadly, the answer is pretty obvious. If the average of 15 scores is 66, then their sum is 990 when you add them all up. Any set of numbers (each one 100 or less) that adds up to 990 can be a set of scores that average 66.
I am not at all sure how it will help you find 13 times 8!