Formulas
Formula for IQR (interquartile range)
Q3 - Q1
the median
What does the word EACH mean?
That number gets the variable
How can you tell if a graph is proportional
If it touches 0,0 and is a straight line
What is the difference between an equation, expression, and inequality?
Equations have an = sign
Expressions do not
Inequalities use the symbols <, >, < and >
Formula for Percent Change
new - old / old x 100
What does the words population and sample mean?
Population= everyone
Sample= part or some
What does per mean? For example, You can get $15 per week.
1
The equation y = 4.3x can be used to determine the total cost, y , in dollars, of , x, pounds of apples. What does the number represent in the equation? y = 4.3x
A the number of apples in pound 1
B the number of apples in x pounds
C the cost of pound of apples 1
D the cost of x pounds of apples
C the cost of pound of apples 1
A cook removes a package of food from a freezer and begins to defrost the package. The initial temperature of the package of food is -15 . At noon, the temperature of the package of food has increased to 35. What is the total change in temperature, in degrees Fahrenheit, for the package of food?
50
for this one take the absolute value of -15
15 + 35
formula for constant of proportionality y =
y = rx
How many possible outcomes are there is you flip two coins at the same time?
4
What operation do you do if it says tax and tip?
Subtract
Add
If you are looking at a graph, which point would you find the unit rate at? (if you pick this question, ask to see a picture)
When x = 1 ( 1, the constant of proportionality)
Which expression is equivalent to the expression shown below? 2 + 3(2x + 5)
17 + 6x or 6x+17
formula for constant of proportionality r =
r = y/x
How do you find the mean?
Add up all of the numbers and divide by how many numbers there are
What should you do first when you see a % and a number?
Multiply
How would you set up a proportion for the following question:
The cost for 10 ounces of organic blueberries is $2.70. Which equation can be used to determine x, the cost, in dollars, for 30 ounces of organic blueberries?
10 ounces = 30 ounces
$ 2.70 x
Katelyn wants to buy a $75.00 skateboard. She has $25.00 saved so far. She mows lawns to make extra money and earns $20.00 for each lawn she mows. Which inequality can be used to determine the number of lawns, x, she needs to mow to have enough money to buy the skateboard?
A) 25 +20x < 75
B) 25+20x ≥ 75
C) 20+25x < 75
D) 20 +25x ≥ 75
B) 25+20x ≥ 75
formula for simple interest
I = PRT
Based on a weather report, the probability that it will rain tomorrow is 0.13. Which word describes the likelihood that it will rain tomorrow? ( options; certain, impossible, likely or unlikely)
unlikely
If a question says "miles per hour" "seconds per minute" or has a fraction in it what operation should you immediately do?
Divide
On a map, two cities are 2.8 inches apart. The map has a scale of 1 inch to 25 miles. How far apart, in inches, would the same two cities be on a map that has a scale of 1 inch to 40 miles?
1.75
Write an equation and solve :
Ms. Gartland bought x number of shirts for the new members of her chorus. The cost for x number of shirts, including $3.99 shipping, was $77.49. Each shirt cost $12.25. There was no sales tax on this purchase.
12.25 x + 3.99 = 77.49
Ms. Gartland bought 6 shirts.