Percents
What percent of 50 is 15?
30%
If the diameter of a circle is 38.4 feet, how much is the radius?
19.2 feet
A family drives 4 1/2 miles in 1/10 of an hour. What is their rate of speed in miles per hour?
45 miles per hour
How do you know if a graph is proportional?
It forms a straight line and goes through the point (0,0).
The temperature at 9am was 4 degrees. At 7pm the temperature was -12 degrees. What was the change in temperature?
-16 degrees
Kaizley is buying a skateboard $37.50. If she gets a 20% discount, how much did she spend?
$30.00
Find the circumference of a circle with a diameter of 17 meters.
53.38 meters
Who has the slowest typing speed?
Georgie: 320 words in 8 minutes
Tara: 403 words in 10 minutes
Frank: 474 words in 12 minutes
Lupe: 567 words in 14 minutes
Frank: 39.5 words per minute
How do you know if a table is proportional?
The unit rates of each set of numbers will be the same.
The cost of whole milk was $3.55. It increase by $0.21, then decreased by $0.45, and then increased by $0.03. What is the cost of whole milk now?
$3.34
There are 99 males and 121 females participating in a marathon. What percent of the participants are female?
55%
Find the area of a circle with a radius of 6.6 inches.
136.78 square inches
A 21.5 oz. box of cereal sells for $3.44 and a 17 oz. box for $3.06. Which cereal has the lowest cost?
The 21.5 oz. box is cheaper. $0.16 per oz.
If one mile is 5,280 feet, how many miles are in 6,600 feet?
1.25 miles
The drama club spent $8.50 per person on food for a cast party. The total cost of the food was $229.50. How many people were at the cast party?
27 people
Cameron has 75% as many shirts as her brother. How many shirts does her brother have if Cameron has 9 shirts?
He has 12 shirts
Find the area of a circle with a diameter of 16 cm.
200.96 square cm.
Ethan is hiking down into the canyon at a rate of 65 feet in 3 1/4 minutes. At this same rate, where will he be after 20 minutes?
400 feet down
Is the equation -2x +7 = 32 proportional? How do you know?
No, it is not proportional. If you graph the equation it will not go through (0,0) because of the 7 added to the 2x.
Briana has 4 1/2 cups of oats. She uses 2 1/4 cups of oats to make cookies and then borrows 1 cup of oats from a neighbor. If she needs 2 1/2 cups of oats for granola, does she have enough?
Yes, she now has 3.25 cups of oats for the granola.
A coffee table is on sale for 20% off the original price of $115. If there is a 7.5% sales tax, what is the final price of the coffee table?
$98.90
Find the radius of a circle with a circumference of 23.236 square feet.
3.7 feet
A 2-liter bottle of juice costs $2.80 and a box containing six 1/2-liter bottles sells for $3.90. Which option has the higher cost per liter?
A 2-liter bottle costs $1.40 per liter
six 1/2-liter bottles cost $1.30 per liter
The 2-liter bottle costs more.
Ariel bought 2 oatmeal cookies for $1.50.
Melli bought 1/2 dozen oatmeal cookies for $4.50.
Becky bought 8 oatmeal cookies for $6.00.
Do the number of cookies and the cost have a proportional relationship?
Yes, they are all $0.75 per cookie.
Which answers are negative if x is negative? Select all that apply.
-6x 4x -3(-x) 0x -x
4x -3(-x)