2) Let f (x) = if} on the interval [0,5]. Let n = 4 subintervals. Use this information to do the following problems: [5 pts] a) Calculate Ax. b) Sketch shade the Left Riemann Sum L4. Be sure to clearly label the x values at each subinterval. 0} Calculate the value of L4. Show complete set-up of what you're adding before using a calculator. [Note: you can use the applet given in the book to check your answers]