Learn To Be brings free online tutoring students around the United States. Volunteer and gain community service hours while helping students who need it./p>

Riemann sums challenge

The sum of the areas of the rectangles in the figure below approximates the area under the graph of the function f(x)=90.1x2f(x)=9-0.1x^2 above the interval [2,8][2,8].
What is the sum of the areas of the rectangles?