Find the general lower and upper sums (in terms of n) of the area of the region bounded by the x-axis and g(x) =20x over [7, 8]. Lower Sum: Upper Sum: Determine the lower and upper sum when [7, 8] is divided into 10 subintervals. Lower Sum: Upper Sum: Determine the lower and upper sum when [7, 8] is divided into 100 subintervals. Lower Sum: Upper Sum: Determine the lower and upper sum when [7, 8] is divided into 1000 subintervals. Lower Sum: Upper Sum: Use the above progression of lower and upper sums to determine the exact area of the region. Net Area =