Unit Rates
A smoothie costs $8 for 4 drinks. What is the unit rate?
$2 per drink
Which ratio is equivalent to 2/3?
A. 4/6
B. 2/6
c. 3/2
D. 6/4
A 4/6
Is this proportional?
$5 per movie ticket
Yes
What is the slope of a line through (0,0) and (2,6)?
3
What does bias mean in a survey?
Favoring a group/ not giving everyone an equal opportunity
A car travels 120 miles in 3 hours. How many miles per hour?
40 mph
Solve 3 x
____ = _____
4 12
x=9
$20 sign-up fee plus $8 per month
No
Which point gives the greatest slope?
A. (2,4)
B. (3,6)
C. (4,12)
D. (5,5)
C. (4,12)
Is this sample biased?
Surveying students from one sports team about favorite school lunches
Yes
A bag of rice costs $6 for 3/2 pounds. What is the price per pound?
$4 per lbs
A recipe uses 5 cups of flour for every 2 cups of sugar.
How much sugar is needed for 15 cups of flour?
6 cups
A graph is a straight line passing through (0,0).
Yes.
A scale drawing uses 1 cm = 4 feet.
A table measures 3 cm by 2 cm.
What is the real area?
96 ft3
Which is the BEST random sample?
A. Asking friends
B. Asking students in one class
C. Asking every 10th student leaving school
D. Asking only honor students
C. Asking every 10th student leaving school
A runner goes 7.5 miles in 3/4 hours. What is the unit rate?
10 mph
Which proportion could find the missing value?
“4 notebooks cost $10. How much do 14 notebooks cost?”
A. 4/10 =14/x B. 10/4=x/14
C. 4/14=10/x D. x/4=14/10
B. 10/4=x/14
A graph is a straight line passing through (0,5).
No
Two similar triangles lie on the same line.
What must be the same: slope, length, or both?
Slope
A survey shows 12 out of 40 students prefer online testing.
Out of 200 students, about how many would prefer online testing?
60 Students
A printer prints 180 pages in 2.5 minutes. How many pages per minute?
72 pages per minute
True or False:
If two ratios form a proportion, they must have the same unit rate.
True
Explain ONE reason a relationship might NOT be proportional.
Teachers choice :)
True or False:
All proportional relationships have a constant slope.
True
Why is random sampling important when making predictions?
It reduces biases