26. If the domain of inverse of f(x) = x - 4x + 5, x 2 is [a, ) then find the value of,a". 27.Let f(x)=x + 9. If a point,,C" satisfies the mean value theorem for the function on the interval [0, 7]. Find 4C. 28.If 2ab 4ab = 6b, a > 0, b > 0 then find the minimum value of ab - 29. Volume of parallelepiped (A, B, C) is A = (5,6,1), B = (0,2,3), C = (3,4,5) 30. If the area between y = x and y = x is K. Find 15K.