Evaluate the triple integral of the function f(x, y, z) = 9x + 2y over the solid tetrahedron bounded by the planes x = 0, y = 0, z = 0, and x + y + z = 1. (Give the exact answer.) Evaluation of a Triple Integral 4- 3- Z 2- TH FOA y 0.2 0.4 0.6 0.8 X Yellow: f(x,y,z), Green: tetrahedron