I need help with these two problems please, and please answer all parts and make it legible.

Find the specic function values. Complete parts (a) through (cl) below. X'Y 22 Y\" f(X.y.Z) = (a) f(1, 4,5) = D (Simplify your answer.) Find and sketch the domain for the function. f(x,y) = (x2 -4) (y2 -25) . . . . . Find the domain of the function. Express the domain so that coefficients have no common factors other than 1. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The domain is all points (x,y) satisfying > 0. O B. The domain is all points (x,y) satisfying #0. O C. The domain is all points (x,y) satisfying 20. O D. The domain is the entire xy-plane