If `x^2 + y^2 =4` then sum of maximum and minimum values of `3x + 4y` is equal to

If x^(2)+y^(2)=1 , the minimum and maximum values of x+y are

If x-2y=4 the minimum value of xy is

If 2x+3y=4 , find the maximum or minimum value of xy.

If x and y are real numbers connected by the equation 9x ^(2)+2xy+y^(2) -92x-20y+244=0, then the sum of maximum value of x and the minimum value of y is :

If x and y are real numbers connected by the equation 9x ^(2)+2xy+y^(2) -92x-20y+244=0, then the sum of maximum value of x and the minimum value of y is :

If x-2y = 4, then the minimum value of xy is

If x^2+y^2=4 then find the maximum value of (x^3+y^3)/(x+y)