math 2 placeup exam

perimeter of any polygon:

the sum of the sides lengths

squares from 1²- 12²

1²=1, 2²=4, 3²=9, 4²=16, 5²=25, 6²=36, 7²=49, 8²=64, 9²=81, 10²=100, 11²= 121, 12²= 144

cubes from 1³-5³

1³=1, 2³=8, 3³=27, 4³=64, 5³=125

PE(MD)(AS)

work from left to right

area and perimeter of a square

a= s², p=4s

gcd/ (7,14)

two integers is the largest integer that divides evenly into both; 7

lcm/ (7,14)

two integers is the smallest integer that is evenly divisible into both; 14

area and perimeter of a rectangle

a= l*w, p=2l+2w

triangle perimeter

p= side 1+ side 2 + side 3

isosceles

triangle has exactly two sides of equal length

equilateral

triangle has three sides of equal length and all angles are 60 degrees

triangle area

a=1/2 bh

decimal representations of common factors

1/5= 0.2, ½ = 0.5, 1/4=0.25, 1/3=0.3(repeating), 2/3=0.6(repeating), 3/4= 0.75

trapezoid area

A= ½ (b1+b2)*h

simple interest

the amount of money you make in interest, I, when investing P dollars in non compounding investment with interest rate r overtime t is: I=Prt

Price change formulas 

• amount of discount= discount rate *original price 

• new price= original price - discount price 

• amount of markup= markup rate* original price

• new price= price+markup price

uniform motion

an object moving a constant rate r in a straight line for time t will go a distance: d=rt

In any setting a constant rate we have

new amount= starting amount+rate*time

the angle in any triangle sum to

180 degrees