Answer:
What is countercurrent multiplication? ... Countercurrent multiplication in the kidneys is the process of using energy to generate an osmotic gradient that enables you to reabsorb water from the tubular fluid and produce concentrated urine.
 
        
             
        
        
        
Since  (density = mass/volume), we can get the mass/weight of the liquid by integrating the density
 (density = mass/volume), we can get the mass/weight of the liquid by integrating the density  over the interior of the tank. This is done with the integral
 over the interior of the tank. This is done with the integral

which is more readily computed in cylindrical coordinates as

 
        
             
        
        
        
Answer: 29
Step-by-step explanation:
d = √(l2 + w2 + h2)
d = √(12^2+ 16^2+ 21^2) = 29
 
        
             
        
        
        
SOLUTION 
We want to find the area of the circle in the picture given.
We have been given the formula as 

From the circle, the radius r = 11 in. 
The area of the circle becomes 

Hence the answer is 363 square-inches