(a) By reading values from the given graph of f, use five rectangles to find a lower estimate for the area under the given graph of f, the x-axis, and the lines x = 0 and x = 10. (Round your answer to one decimal place.) 17.1 Sketch the rectangles to illustrate the estimate. y 4 2 y= f(x) X 4 8 y 4 2 y= f(x) X 4 8 4 y 2 y = f(x) X 4 8 y 6 y = f(x) 4 2 X 4 8 00 By reading values from the given graph of f, use five rectangles to find an upper estimate for the area under the given graph of f, the x-axis, and the lines x = 0 and x = 10. (Round your answer to one decimal place.) Sketch the rectangles to illustrate the estimate. y 6 4 2 y= f(x) X 8 6 y= f(x) 4 2 4 y 2 y = f(x) X 4 8 4 8 (b) Find new estimates using ten rectangles in each case. (Round your answers to one decimal place.) lower estimate 17.5 upper estimate y 6 y= f(x) 4 2 8