I need help with these questions

8. The base of a solid is the region in the first quadrant bounded by the line y =- --x+2 and the 2 coordinate axes. If every cross section perpendicular to the x-axis is a square, which of the following ? integrals represents volume of the solid. (45 x+ 2 dx seconds 10. The base of a solid is the region enclosed by y = sin x and the x-axis on the interval [0, ]. If cross sections perpendicular to the x-axis are semicircles, write an integral that represents the volume of the solid. (A) - J" (sinx)' dx " (sin x) dx ? (C) ~ ." (sin x ) dx (D) - J. (sin x ) dx 11. It is known that ( g(x)dx = 1 and that the four regions shown are all equal in area. The area of the region bounded y = f (x) , y = g(x), and the x-axis in Quadrant I is: f(x) 8(x) ? (A) B) NI- Al- W/ A WIN b (D)