Calculate the Riemann sum R(, P,C) for the given function, partition, and choice of sample points. Also, sketch the graph of and the rectangles

Calculate the Riemann sum R(ƒ, P,C) for the given function, partition, and choice of sample points. Also, sketch the graph of ƒ and the rectangles corresponding to R(ƒ, P,C).

f(x) = x, P = {1, 1.2, 1.5, 2), C = {1.1, 1.4, 1.9}