X and T
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3 lines on the letter F because top line, and line below that and the one going up and down
A negative number is when its below zero. a negative number is a number below 0. Example: -5, -2.2, etc.
Check out the related links section below to see an example of a line of best fit.
No. For example, the mean of 1,1,1,1,1,7 is 12/6 = 2: one above and five below.
Alpha symbol is the letter a.Greek letter alpha can't be displayed here. See link below.