Answer:
y'   = (2x + y cosxy)/(2y + x cosxy)
Step-by-step explanation:
Using implicit differentiation:
y^2 = x^2 + sin xy
2y y' = 2x + cos xy  * (xy' + y)
2y y' = 2x + xy' cos xy + y cos xy
2y y' - xy' cosxy = 2x + ycos xy
y'   = (2x + y cosxy)/(2y - x cosxy)
 
        
             
        
        
        
Answer:
Step-by-step explanation:
At the end of any given business day, CFFC has 400-80t cases of perfume on hand, where t = 1 represents Monday, t = 2 represents Tuesday and so on. The inventory becomes nil on Friday evening. So,
The values of a and b are
a = 0
b = 5
Using the formular for average value, we have the average value as

Average inventory is 200 cases
 
        
             
        
        
        
We know that it must equal 9, and that we do x•x-x+6 and find the square root
        
             
        
        
        
The geometric mean of 2 & 200 is *(20)*
        
             
        
        
        
Question 4 is (1,2)
Question 5 is (1,0) 
These are are definitely correct