where m = slope, b = y-int, x+n is a shift left, x-n is a shift right
Distance between two points = make a right triangle and solve for hyp
Percent Increase/Decrease - ANS [(x₂-x₁)/x₁]∙100 = percent change
Given two numbers x₁ and x₂
Empirical Formula - ANS In a normal (Gaussian) distribution, 68% of the data fall w/in 1δ, 95%
w/in 2δ, and 99.7% w/in 3δ of the mean
68-95-99.7
Polygon Formulas
area
sum of interior angles
# of diagonals - ANS Area = (1/2)∙n∙sin(360/n)∙S²
Sum of interior angles = (n-2)∙180
Number of diagonals = (1/2)∙n(n-3)
n = number of sides
S = length from center to a corner
volume of sphere - ANS (4/3)πr³
Combined Work - ANS 1/t₁ + 1/t₂ + 1/t₃ ... = 1/total
Combinatorics - ANS n!/(a!∙b!∙c!∙...)
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