TEST #1 (Classify Numbers, Set Notation, Sec 1.1-1.3) DC

Write the interval notation for

 $\left\{x\ \parallel\ -7<x\le12\right\}$  

Only write the interval and leave no spaces within the interval   
For example:  [15,25)  

(a)  

Only write the interval and leave no spaces within the interval   For example:  [15,25)  

(a)  

Which of the following shows a list of rational numbers?

• $-2,\ 3.47,\ \sqrt{7},\ \frac{1}{4}$

• $-3.5,\ \frac{5}{8},\ 0,\ \sqrt{49}$

• $\frac{1}{2},\ 3\pi,\ 0,\ 2.333...\$

• $3.231...,\ \sqrt{4},\ 7.9,\ 12$

Which of the following can ONLY be identified as whole numbers?

•  $.5,\ 1,\ 4,\ 5,\ 9$ 

•  $-2,\ 0,\ 3,\ 4$ 

•  $0,\ 3,\ 15,\ 125$ 

•  $0,\ \sqrt{4},\ 6,\ \frac{5}{1}$ 

Which of the following statements is false?

• 
• 
• 
• 

 $\left[-4,2\right)\$  Which of the following is the correct set notation for the given interval notation? 

•  $\left\{x\ \parallel\ -4\le x<2\right\}$  

•  $\left\{x\ \parallel\ -4<x\le2\right\}$  

•  $\left\{x\ \parallel\ -4\ge x>2\right\}$  

•  $\left\{x\ \parallel\ -4>x\ge2\right\}$  

Which are rational but not whole numbers?

 $14,\ \sqrt{8},\ -18,\ 0,\ 4.8,\ \frac{6}{5}$  

List as a set of numbers from least to greatest, no spaces within the set. 

For example:  {-12,10/13,7,20}

(a)  

 $\frac{4}{7}\ \in Z$  

• True 

• False

 $-\frac{7}{9}\notin H$  

• True 

• False

 $\ H\not\subset R$  

• True 

• False