b) Consider f(x) = -x +3 3 and let P is the partition P = {1.1 + 1 + , 1 + 2, ..., 1 + = 2 Compute both U(P) and L(P) and show that f(x) is Riemann integrable on [1,2]. Hint: 72 [ k=1/(n+1) k-1