# ACT - Math

## 41 terms

### 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=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

### 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

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 . . .

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

When multiplying variable with exponents

### Multiply the exponents

When taking variables with exponents to a power

### Perimeter

the distance around a figure; add all the sides together

### Prime Number

a number with only 2 factors....one and itself.