OL CBA #1 Review 2025

​CBA #1 Review
Use your notes and the examples before the question sets to help refresh your memory. Take your time and ask questions if you don't know what to do! This is to help review for your test on Monday.

Squares and Square Roots

Multiple Choice

Evaluate

$$\sqrt{36}$$  

• 6

• 18

• 18

• 9

Multiple Choice

The area of a blanket is 100 inches. What is the length of one side? Hint: find the square root of 100

• 50

• 10

• 25

• 2

Real Numbers

Be able to categorize numbers . Use you brace map chart to help you.

Multiple Choice

• A. because, integers and rational numbers have no numbers in common.

• B. because, integers and rational numbers have some numbers in common.

• C. because, all integers are rational numbers

• D. because, all rational numbers are integers

Multiple Choice

• F

• G

• H

• J

Multiple Choice

What is 0.00000786 in scientific notation?

• $$7.86\ x\ 10^{-5}$$  

• $$7.86\ x\ 10^5$$  

• $$7.86\ x\ 10^{-6}$$  

• $$7.86\ x\ 10^6$$  

Multiple Choice

What is 47,500,000 in scientific notation?

• $$47.5\ x\ 10^6$$  

• $$4.75\ x\ 10^7$$  

• $$4.75^7$$  

• $$475\ x10^5$$  

Multiple Choice

How would you write 564,000,000 in scientific notation?

• 5.64 x 10^-7

• 5.64 x 10⁶

• 5.64 x 10⁸

• 56.4 x 10⁷

When solving inequality word problems, remember the key words and phrases that go along with each inequality symbol:

Multiple Choice

Cody’s Gym charges a $15 fee to join and $30 per month. Tyler’s Gym charges a $30 fee to join and $20 per month. Write an inequality that could be used to determine after how many months Tyler’s gym would be a better deal.

• 30 + 20x < 15 + 30x
• 30x + 20 < 15x + 30
• 30 + 20x > 15 + 30x
• 30x + 20 > 15x + 30

Multiple Choice

• 30x < 330 + 50x

• 50x > 330 + 30x

• 30x > 330 + 50x

• 50x < 330 + 30x

Multiple Choice

Solve for x:

4(1 - x) + 3x = -2(x + 1)

• x = -6

• x = 6

• x = 3

Multiple Choice

Solve:

5y+34 = -2(-7y+1)

• y = -4

• y = 9

• y = 4

• y = 36/19

Multiple Choice

• x = 1

• x = 2

• x = 1/2

• x = 3/2

Multiple Choice

Starting money = $350.
Interest rate = 2.5%
TIme = 3 years.
How much interest?

• $7.50
• $26.25
• $87.5
• $262.50

Multiple Choice

Your 3 year investment of $20,000 received 5.2% interest compounded annually.  What is your total return?

• $23,285.05
• $3,285.05
• $2,385
• $32,285

Multiple Choice

Mr. Diable invested $3,500 in a 7 year CD that pays 4.2% interest compounded annually. How much interest will the CD earn over the 7 years?

• $147.00

• $245.00

• $1,168.12

• $4,668.12

Multiple Choice

Travis invests $25,000 in a savings account that pays 2.75% simple interest. How much interest does he earn each year? 

• $787.50
• $625.00
• $657.50
• $687.50

​To find the MAD:

Find the mean of the set of data.

Take each number in the data set, subtract the mean, and take the absolute value.

Then take the sum of the absolute values.​

Then divide the sum by the total number of values in the data set.​

​

​

Subject | Subject

Some text here about the topic of discussion

Example: Find the MAD of 3, 3, 2, 2, 6, 8.​

​

• ​3 + 3 + 2 + 2 + 6 + 8 = 24

• 24 ÷ 6 = 4

• 4 - 3 = 1

• 4 - 3 = 1

• 4 - 2 = 2

• 4 - 2 = 2

• 6 - 4 = 2

• 8 - 4 = 4​

• 1 + 1 + 2 + 2 + 2 + 4 = ​12

• 12 ÷ 6 = 2​

​

The MAD is 2.

Multiple Choice

Find the Mean Absolute Deviation:

5, 11, 2, 7, 16.

• 3.24

• 2.84

• 1.24

• 4.24