Maria played a game with her little sister for 2/5 hour and read her little sister a book for 5/8 hour. What is the best estimate for the total time Maria spent with her little sister?

Drag and drop an answer into each box to correctly complete the sentences.

2/5 hour is closest to . 5/8 hour is closest to . Therefore, the best estimate for the total time Maria was with her sister is close to .

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)