irrational number, any real number that cannot be expressed as the quotient of two integers.
Any number that can be written as a fraction with integers is called a rational number . For example, 17 and −34 are rational numbers. (Note that there is more than one way to write the same rational number as a ratio of integers.
1st Is rational 
2nd one is irrational
3rd is irrational 
4th is rational 
 
        
             
        
        
        
Answer:       A                 B
Group 1     0.25          0.75
Group 2    0.44          0.56
Step-by-step explanation:
Since we have given that 
Number of people of A in group 1 = 15
Number of people of B in group 1 = 45
Total number of people in group 1 is given by

Relative frequency of people of A in Group 1 is given by

Relative frequency of people of B in Group 1 is given by

Similarly, Number of people of A in group 2 = 20
Number of people of B in group 2 = 25
 Total number of people in group 2 is given by

Relative frequency of people of A in Group 2 is given by

Relative frequency of people of B in Group 2 is given by

Hence,        A                 B
Group 1     0.25          0.75
Group 2    0.44          0.56
 
        
             
        
        
        
Answer:
17
Step-by-step explanation:
(7x)° + 61° = 180° (interior angle Postulate) 
(7x)° = 180° - 61°
(7x)° =119°
7x = 119

 
        
             
        
        
        
Answer:
G: (-2, 0.5)
Step-by-step explanation:
the "X" is -2 and then the "Y" is 0.5 because it is between 0 and 1, so we could the that Y-axis is being added by 0.5 each time.
 
        
             
        
        
        
16. .375 mi
19. 440 yards 
20. 500 pounds 
21. I don’t fw graphs : 3 hopes this helps sum