Find the area and round to the nearest tenth: diameter equals 5 1/2 yards

Pick the expression that matches this description: a polynomial of the 5th degree with a leading coefficient of 7 and a constant term of 6 (choice a) 7x^5+2x^2+6 (choice b) 7x^6−6x^4+5 (choice c) 6x^7−x^5+5 (choice d) 6x^5+x^4+7

What is the angle measure, or angle of depression, between this bird and the bird watcher?

Find the volume of the wedge cut from the first octant by the cylinder z=12-3y^2 and the plane x+y=2.