SAT math formulas

density formula

density = mass/volume

speed formula

speed = distance/time

vertex formula

y = a(x - h)² + k

completing the square

c = (b/2)²

zero product property

if ab = 0, either a = 0 or b = 0

trigonometry in different quadrants

product of the roots

c/a

sum of the roots

-b/a

percent change (increase/decrease)

new - old / old

compound interest

A = P(1 + r)^t

compound interest (but its compounded more than once per year)

A = P (1 + r/n)^nt (n is the number of times interest is compounded per year)

simple interest

A = P(1 +rt)

sum of angles in a polygon

180(n-2)

exterior angle

sum of the two angles furthest away from it

finding vertex formula

-b/2a