-4- (2) Given the following level curves for an unknown function f(x,y), -3 25 -2- 16 10 1- 4 0 Estimate the following. Show computations on b,c,d. ( 8 points) (a) f(1, 2.5) (b) of ax |(1, 25) (c) f (1, 1 ). (d) Daf (2, 2 ) where u = (# #)