41 terms

# ACT - Math

###### PLAY
Real numbers
all numbers except imaginary numbers
Integer
positive and negative whole numbers including zero
Counting Numbers
positive whole numbers (excludes zero)
Rational Numbers
any number that can be expressed by a fraction
Irrational numbers
decimal numbers that continue forever without repeating
Diagonal
line connecting one vertice to another
y-intercept form
y=mx + b
Slope
rise over run; angle of a line expressed as a fraction; it is the m in the y-intercept form
Parabola
a graph of a line that looks like a U; has the equation X²
Reflection
flopping a point or shape across an line (usually x or y axis)
Translate
moving a point or shape on a graph
Rotate
turning a shape on a graph
ratio
a comparison of two items in a fraction; Can be written with a semicolon; For example, 3:2.
Percentage
number out of 100; can be written as a decimal
Reciprocal
A fraction flipped upside; 1/2 and 2/1 are reciprocals
y-intercept
Point where a line intercepts the y-axis
Coordinate
Location of a point on a graph in the form (x,y) where x moves left and right, y moves up and down
Equation of a horizontal line
y=any number; ex. y=4, y=-6
Equation of a vertical line
x=any number; ex. x=3, x=-1
Area of a circle
Pi time radius squared
Absolute Value
distance from zero; take off the negative sign
Average (mean)
add numbers and then divide by number of terms
Least Common Denominator (LCD)
lowest number that all numbers are factors of
Common Denominator
number that all numbers are factors of
FOIL
Distributing by First, Outer, Inner, Last
Permutation
All the different ways of arranging something
zero property of multiplication
any number times 0 equals 0
Pythagorean Theorem
a²+b²=c²
Area of triangle
1/2 base x height (1/2 bh)
distance from center to outer edge of a circle
Diameter
distance across a circle through the center
Up
Positive parabolas open . . .
Down
Negative parabolas open . . .
Arc
part of a circle
Equals
In math the term "is" means
Multiply
In math the term "of" means
Mark up
the amount ADDED to the original price of an item is called the