Yes, real numbers are always rational numbers
        
             
        
        
        
Answer:
The height of the triangle is  cm.
 cm.
Step-by-step explanation:
----------------------------------------
The formula for solving the area of a triangle is   where
 where  stands for base and
 stands for base and  stands for height.
 stands for height.
Let's substitute 30  for the area and 10 for the base.
 for the area and 10 for the base.

-------------------->>>>
Now, let's solve to find the height.

Multiply  times
 times 

Divide both sides by 5.

-----------------------------------------
Hope this is helpful.
 
        
             
        
        
        
Answer:
Number of high quality version downloads = 880
Step-by-step explanation:
Let, 
x be the number of standard version songs downloaded
y be the number of high quality version songs downloaded 
According to given statement,
x+y=1600        Eqn 1 
2.8x+4.1y=5624     Eqn 2 
Multiplying Eqn 1 by 2.8 to eliminate x
2.8(x+y=1600)
2.8x+2.8y=4480     Eqn 3 
Subtracting Eqn 3 from Eqn 2 
(2.8x+4.1y)-(2.8x+2.8y)=5624-4480
2.8x+4.1y-2.8x-2.8y=1144
1.3y=1144
Dividing both sides by 1.3

Hence, 
Number of high quality version downloads = 880