please help with these

4. R denotes the region bounded by the curves 3; = (a: 7 1)2 and y : ln(m). A solid is created when R is rotated about the line y = 0. What is the volume of this solid? (You may set up and evaluate the integral using a calculator.) 6. What is the approximate volume of the solid created when the region under the curve y = cos :1: on the interval [ g, g] is rotated around the :1: axis ? (Set this up algebraically, but then feel free to use a graphing calculator to evaluate the integral.) 7. What is the approximate volume of the solid created when the region under the curve y = sin a: on the interval [0, 71'] is rotated around the x-axis? (Set this up algebraically, but then to evaluate feel free to use a graphing calculator to evaluate the integral.)