For Exercises 1 and 2, let f(x, y) = x+2y on R:0≤x≤2. 0≤ y ≤1. and let P be the partition P = P₁ x P2. 1. Find L(P) and U(P) given that P₁ = {0, 1, 2, 2} and P2 = {0,1,1}. 2. Find L(P) and U(P) given that P₁ = {0, 1, 1, 3, 2} and P₂ = {0,1,1,1,1}.