Answer:
 √a(√a + 2)          a - 2√a
----------------- = -----------------
     a - 4                a - 4
Step-by-step explanation:
I am assuming that by "sqrt(a)/sqrt(a)-2" you meant:
√a
----------
√a - 2
To rationalize the denom., multiply numerator and denom. of this fraction by the conjugate of √a - 2, which is √a + 2:
 √a(√a + 2)
-----------------
     a - 4
 
        
             
        
        
        
Answer:
2 pounds 
Step-by-step explanation:
10-4-2.40=3.60 
3.60/1.80= 2