C=2∏r

or

C=∏d

Same as slope of original line

Slope of Perpendicular Line

Negative inverse of original slope

ex. original slope = 2/3

perpendicular slope = -3/2

FOIL

(x+a)²

First, Outside, Inside, Last

ex

(x+a)(x+a)=x²+2ax+a²

(x-h)² + (y-k)² = r²

(h,k) is center point

r = radius

What are vertical angles and what do yo uknow of their measurements?

Probability=# of successes/# of possible outcomes

Least Common Multiple

4 and 6

smallest number that two numbers will divide into

Answer: 12

Greatest Common Factor

8 and 12

Largest number that divides evenly into both 8 and 12

answer: 4

A=Base*Height

Height is measured perpendicular to base

Number pattern in which there is a common number either added or subtracted

Ex 6, 10, ?, ?, 22, 26

adding 4 each time

numbers pattern that has a common ratio

(multiple or divide by same number)

Ex 1, 2, ?, ?, 16, 32

Answer: 2

1, 1, 2, 4, 5, 5, 5, 9

Find the

mean

median

mode

range

Mean = Average of the numbers = 4

Median = middle # or avg of middle two #s when in order = 4.5

Mode = # appears most often = 5

Range = largest # - smallest # = 8

percent problems formula

60% of 30 is what number?

is =      percent

of            100   

60   =    30

x         100

Answer: 200

PEMDAS

Parentheses

Exponents

Multiplication/Division (order not important)

Addition/Subtraction (must be done left to right)

(Please excuse my dear aunt Sally)