Rational Number Operations
5.5 - (-10)
15.5
What does an open circle on a number line mean?
Greater than
Less than
Edwin is collecting baseball cards. He already has 150 and he collects 12 new cards each month. Which inequality shows after how many months, m, Edwin will have more than 220 cards?
150 + 12m > 220
10 > 4x - 10
5 > x
x < 5
How do we find the mean of a data set?
Add up all of the numbers then divide by how many numbers are in the data set.
A negative number plus a negative number will always equal...
A negative number
What does a closed circle on a number line mean?
Greater than or equal to
Less than or equal to
Kabriel has a bottle of water with 20 ounces of water in it. He pours the water out at a rate of 2 ounce per second.
Write an equation to find after how many seconds, s, Kabriel will have exactly 6 ounces of water.
20 - 2s = 6
15 - p = 6
p = 9
Find the mean of the data set:
100, 96, 90, 98
96
-40.2 * -6
241.2
3 + 6x < 21
x < 3
5y + 4 = 38
A. Eden has already run 5 miles and plans to run 4 more miles each day. After how many days will she have run 38 miles?
B. There are 4 gallons of water in a bucket and CJ pours 5 gallons out each minute. After how many minutes will there be 38 gallons in the bucket?
C. Jordan has already made 4 cookies and can make 5 more each hour. After how many hours will he have made 38 cookies?
C
1000 = -50d - 600
d = -32
Find the mean of the data set:
-5, 2, -11, 4, 0
-2
Diego is buying pizza for his class. There are 30 students in his class and each student will eat 2 pieces of pizza. If a pizza has 10 pieces in it, how many pizzas does Diego need to buy?
6 pizzas
Plot the answer to the inequality on a number line.
2z - 30 >= -4
z >= 13
Carlos has $30 to spend at the mall. He buys a pair of pants for $9 and each shirt costs $2.50. How many shirts can Carlos buy if he can spend at most $30?
30 >= 9 + 2.50x
-3z + 14 > -1
z < 5
Find the mean of the data set:
13, 5.4, 16.8, 6
10.3
Autumn went to the State Fair of Texas and bought a funnel cake for $5.50 and a lemonade for $3.25. If she gave the cashier a $10 bill how much change will Autumn receive?
$1.25
Plot the answer to the inequality on the number line.
13 > -3m + 4
-3 < m
m > -3
Ms. Schrank has been practicing how fast she can type. She can type 68wpm right now and has been improving at a rate of 4wpm every week. After how many weeks will Ms. Schrank be able to type more than 100wpm?
68 + 4x > 100
-1.2t + 2.4 = 12
t = -8
Find the mean of the data set:
-4.1, 7.2, 20, -2, -1.6
3.9