this is about triple integral in rectangular coordinate

Problem 3. [30 points] (a) [10 points] Evaluate the integral 1+sty f (x, y,z)dzdydx where f(x, y, z) = 1. (b) [20 points] Find the volume of the solid bounded between 2 planes x + z - 5 = 0 and z = 1 and bounded by x2 + y? =9 in R3