The answer is the mean.
"For a data set, the arithmetic mean, also called the mathematical expectation or average, is the central value of a discrete set of numbers: specifically, the sum of the values divided by the number of values."- Wikipedia
(-4-(-7)) / (1-7) = (3) / (-6) = -1/2 = slope
The tree's grow rate is 1.1 per month
7.48/6.8
=1.1
Dino nuggets
Bro stop scrolling