Mr. jones jogs the same route each day. the amount of time he jogs is inversely proportional to his jogging rate. what option gives possible rates and times for two of his jogs? 4 mph for 2.5 hours and 6 mph for 3.75 hours 3 mph for 2 hours and 4.5 mph for 3 hours 4 mph for 2.5 hours and 5 mph for 2 hours 4 mph for 2.5 hours and 3 mph for 3.5 hours

For every corresponding pair of cross sections, the area of the cross section of a sphere with radius r is equal to the area of the cross section of a cylinder with radius and height 2r minus the volume of two cones, each with a radius and height of r. a cross section of the sphere is and a cross section of the cylinder minus the cones, taken parallel to the base of cylinder, is the volume of the cylinder with radius r and height 2r is and the volume of each cone with radius r and height r is 1/3 pie r^3. so the volume of the cylinder minus the two cones is therefore, the volume of the cylinder is 4/3pie r^3 by cavalieri's principle. (fill in options are: r/2- r- 2r- an annulus- a circle -1/3pier^3- 2/3pier^3- 4/3pier^3- 5/3pier^3- 2pier^3- 4pier^3)