Answer:
Natural Numbers, Whole Numbers, and Integers are rational numbers. 
Example: {1, 2, 3, -1, -2, -3}
Numbers with repeating decimals and terminating decimals are also rational.
Example: {2.34343434..., 3.45}
If a square root makes a perfect square, then it is rational. 
Example: {√16, √100}
Hope this helps. 
 
        
             
        
        
        
Answer:
She should order a total of 5,160 medium sized t-shirts 
Step-by-step explanation:
To calculate the number of medium sized t-shirt to be ordered, we shall be using the proportion of students that wanted medium sized t-shirt in her survey to multiply the total number of students that we have.
From the question, we can identify that the probability that a student will like a medium sized t-shirt is simply 129/300
Now we have about 12000 students in the University, using the probability from the survey, the number of medium sized t shirt she should order would be;
129/300 * 12,000 = 129 * 40 = 5,160 medium sized t-shirts 
 
        
             
        
        
        
Given:
The base of the given triangle has two part:
Left( left side of the hypotenuse) = 25
Right ( right side of the hypotenuse) = x
The altitude (h) = 60
To find the value of x.
Formula:
By Altitude rule we know that, the altitude of a triangle is mean proportional between the right and left part of the hypotenuse,

Now,
Putting,
left = 25, altitude = 60 and right = x we get,

or,  [ by cross multiplication]
 [ by cross multiplication]
or, 
or, 
Hence,
The value of x is 144.
 
        
                    
             
        
        
        
Answer:
To find the number of apples per basket we divide 90 by 6 to get 15. We know that he buys 15 apples. We now have to divide by 3 to get the number of apples per pie, because we know he used all 15 apples. The answer is 15/3 or 5 apples per pie. 5 apples