The set of real numbers is all numbers that can be shown on a number line. It also includes rational numbers, which are numbers that can be written as a ratio of two integers, and irrational numbers, which cannot be written as a the ratio of two integers.
        
             
        
        
        
Which numbers do you want? Also, you have to do the same thing on the other side if you do it on one. 
        
             
        
        
        
Answer:
18. 20,000. 
19. 0
7. 1
11. 101
Step-by-step explanation:
18. I think is stays the same, because an integer is a number that is not a fraction. So still 20,000.
19. Sea level is at zero altitude. So answer is 0.
7. |17-16| = |1| = 1. The lines around it are called absolute value signs and mean to make the answer positive. 
11. |-101| = 101. As said before the lines mean to make the inside part positive. 
 
        
             
        
        
        
The probability of not drawing a penny is 13/20, or 0.65, or 65%