Let I=\int_0^4 f(x)dx, where f is the function whose graph is shown below. (a) Use the graph to find L_(2),R_(2) and M_(2). L_(2)=ubrace(\times ubrace) R_(2)= M_(2)=^(\times )(b) Are these underestimates or overestimates of I ? L_(2) is an underestimate. L_(2) is an overestimate. That's right! R_(2) is an underestimate. R_(2) is an overestimate. Well done! M_(2) is an underestimate. M_(2) is an overestimate. Amazing work! (c) Use the graph to find T_(2). T_(2)= How does it compare with I ? T_(2) values.