Becky adds 3/4 gallon of gasoline into her snow thrower's empty fuel tank. she uses 1/4 gallon for the snowstorm on friday, and then uses another 1/4 gallon for the snowstorms on sunday. is the fuel tank empty after becky uses the snow thrower on sunday? explain. if her fuel tank is not empty again, what single action could have been changed so that it is empty again? explain.

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)