Number Sense
What is an irrational number?
A number that cannot be expressed as a fraction
The dots on a scatter plot increase at a constant 45 degree angle on the graph. Describe the strength and relationship of the graph.
strong positive
It costs $12 per hour to rent a bowling lane and $5 to rent the shoes. Write an equation to represent the situation.
y = 12x + 5
see board:solve for a
a = 80
Change $200 USD to CAD when 1 USD = $1.42 CAD
$200 x 1.42 = $284 CAD
Express 37.5 as a fraction in lowest terms.
1/8
Histograms display data as ________ of numeric data and their frequencies for one variable that is continuous.
intervals
Solve for x when y = 123. Y = 5x + 18
x = 21
see board: what is the relationship between a and b?
corresponding
Give an advantage and disadvantage of using a credit card in a foreign country?
Advantage: points, convenient/widely accepted, build credit
Disadvantage: foreign transaction fee, may not be accepted in marketplaces, potentially frozen card
see question on paper
-3
Willow wanted to find out if there is a relationship between how tall someone is and how long it takes them to run 100 metres. She measured the heights of some Grade 8 students and then timed each student as they ran 100 metres.
What type of data is used in this situation?
Two-variable OR continuous
Write an equation to represent the situation:
x | y
2 | 54
4 | 48
6 | 42
y = -3x + 60
What is the measure of each angle in an equilateral pentagon?
108
Name 3 sources of income, not including gifts.
salary/job, tips/gratuities, commission, interest/profit earned from investments
Express 1.0 × 10−6 in word form.
1 millionth
Mount Rival hosts a soccer tournament each year. This season, in 10 games, the lead scorer for the home team scored 7, 5, 0, 7, 8, 5, 5, 4, 1 and 5 goals. What is the mean score of this player?
4.7 goals
x(x + 2) + 3(x^2 + 2x – 5)
4x^2 + 8x - 15
see board: solve for x
x = -10
Name 6 expenses for someone in their early 20s
rent, living expenses (hydro, internet), tuition, phone, entertainment, medical, gifts, transportation
Grayson can type 1800 words in 15 minutes.
How many words can Grayson type in 2 hours?
14,400
What graphs show two-variable data?
scatter plot & broken-line
Solve: −22 < 6 + 4n
n > -7
see board: solve for x
x = 7.4
In the formula for compound interest, what does each variable represent?
p = principal
n = number of times compounded
r = interest rate (as a decimal)
t = time (in years)