3. Use Riemann Sums with 8 rectangles to approximate the area under the curve f(x) = (x+7)' -5 on [-1,3] showing both (I) the summation you would type in the calculator and (II) the function notation such as f(x)+f(x2)+f(x,)+. (without the . and numbers replacing the x's). (A) right endpoint rectangles (10 pts) (B) left endpoint rectangles (10 pts) (C) midpoint rectangles (10 pts)