The document discusses the calculation of area and volume integrals for several functions. It calculates: 1) The area under the curve y = x^2 + 2x - 3 from x = 1 to x = -3 as 5/3 units. 2) The volume of a solid obtained by rotating the region bounded by the curves y = 4 - 2x from x = 0 to x = 2 about the x-axis as 32/3π units. 3) The total area under several curves by adding the individual areas, coming to a final value of 253/127 units.