## ACT Math

##### Created by:

healthnut13  on September 6, 2011

##### Description:

based on sparknotes online prep

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# ACT Math

 Relatively prime #if they don't share common prime factors
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#### Definitions

Relatively prime # if they don't share common prime factors
Divisible by.... if add up numbers and they are divisible by... 3,9
Last two digits are divisible by .... 4
Its even and divisible by 3 then its divisible by... 6
No rules 7
if last three digits are divisible by .... 8
ratios parts to parts
probability chance of a particular outcome/total # of possible outcomes
when multiply or divide inequality by a negative then switch sign
system of equation w/ infinite solutions same line
inverse of exponential functions x =a^b, logaX = b logs
distance formula Pythagorean theorem, distance is hypotenuse
vertex of a parabola (x-coordinate) & axis of symmetry -b/2a
parabola: a>0 upward
parabola:a<0 downward
circle (x-h)^2 +(y-k)^2 =r^2
center of circle h,k
ellipse: the sum of the distances to any point is constant foci
ellipse:midpoint btwn foci center
Ellipse: equation (x-h)^2/a^2 +(y-k)^2/b^2 =1
period 2pi/a

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