Find the value of n when

If (a-b)=-3 , (b-c)=5 and (c-a)=-2, then the value of .

If x, y are two positive real number and  , then which of the following relations is true?

If 0.4 m + 0.8 n = 2.2 and 0.8 m + 0.4 n = 1.4, then the value of is equal to 

If then the value of will be

If , then the value of

Given k = -3. Find the value of . 

If a²+b²+c² = 2(a – b – c) – 3 then the value of 4a – 3b + 5c is