Alita is 2 times as old as Jiro. Jiro is 4 years younger than Erik. Erik is 1/3 as old as Dawn. The sum of all their ages is 72. What equation could you write to represent this situation?
What is the solution?

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)

Carlos by 24 mi and ran 6 miles what is the ratio of the distance carlos ran to the distance he biked

Which of the following is an arithmetic sequence