ratio & proportional relationships
how to find constant of proportionality
k = y/x
when you take money out of an account
withdrawal
made out of all the points that are the same distance from a given point
circle
the number of degrees inside a triangle
180
mean
average
two things to look for in a proportional relationship graph
straight line through the origin
a negative * a positive
or
a negative / a positive
negative
line segment that goes from the center to the edge of a circle
radius
the spread of the quartiles
interquartile range
list of all possible outcomes
BONUS: what three methods are there?
sample space
tree diagram, list, table
when the values for one quantity are each multiplied by the same number to get the values for the other
proportional relationship
a negative * a negative
or
a negative / a negative
positive
angles that add up to be 180 degrees
supplementary
angles that add up to be 90 degrees
complementary
five categories of likelihood
impossible, unlikely, equally likely as not, likely, certain
tells how much the measurements in a scale drawing represent the actual measurements of the object
scale
what happens when you multiply or divide by a negative in an inequality?
the inequality sign flips
angles that share a side and a vertex
adjacent
vertical
measures of variability
minimum, Q1, median, Q2, maximum
steps for solving percent increase/decrease problems
1. decide if increase or decrease
2. add/subtract from 100%
3. turn percentage into decimal
4. multiply decimal and original amount
steps for solving equations
1. eliminate parentheses (distribute)
2. combine like terms
3. make sure variable is on one side
4.undo addition/subtraction
5. undo multiplication/division
part of an original figure that matches up with part of a copy
corresponding
the average distance from the mean of each data point
mean absolute deviation
three common types of samples
random, systematic, stratified