A) 24
All side lengths of a square are equal so you take the square root of 576 to get two 24. If you try it back: 24*24 (w*h) to get 576.
        
                    
             
        
        
        
To convert a mixed fraction into an improper fraction, we must follow some steps.
First, we take the whole part and multiply it by the denominator of the fraction.
In this case, we take 2 and multiply it by 8.
Now we add the numerator:
16+3=19
The denominator stays the same:

Hope it helps! :)
 
        
             
        
        
        
1 mm
Km etc
Hm etc
Dam etc
M    0.001
Dm 0.01
Cm 0.1
MM 1