7. Determine the points at which the following functions are discontinuous. Describe the type(s) of discontinuity at the points from the following list: removable, jump, infinite, or none of these. a f(x) = c' +2-2 r + 31 + 2 [C6] b. /(z) = C +2 ifs 3 z+1 c f (=) = - 21