Find the volume of the solid generated by revolving about the x-axis the region bounded by the upper half of the ellipse(x^2/a^2)+(y^2/b^2)=1and the x-axis, and thus find the volume of a prolate spheroid. here a and b are positive constants, with a> b. volume of the solid of revolution:

The perimeter of a rectangular lot of land is 436 ft. this includes an easement of x feet of uniform width inside the lot on which no building can be done. if the buildable area is 122 ft by 60 ft, determine the width of the easement. select one: a. 9 feet b. 18 feet c. 4.5 feet d. 7 feet