SAT math formulas

number of degrees in the interior of an n-sided polygon

(n - 2) · 180

general form for a quadratic function

(this is a parabola) y = ax^2 + bx + c

Average to sum

Sum= Average*Number

Mean

The Average, (A+B+C)/3

Harmonic Mean Formula

The average of two speeds=(2*speed1*speed2)/(speed1+speed2)

rule of sets

X is one set, Y is another, both is included in A & B. Total = X + Y - Both + Neither

Distance =

distance = rate · time

Link

http://satprepget800.com/sat-math-formulas-memorize/

Median

the middle when the numbers are in numerical order

Mode

the most frequent number

triangle rule

the third side of a triangle is the amount of numbers between the difference and sum of the other two sides