HELP ME PLEASE Which of the following phrases describes the expression 12 - 2r?
O A a number times the quantity 12 decreased by 2
OB 2 decreased by 12 times a number
OC 12 decreased by 2 times a number
OD 2 times a number decreased by 12

Determine the relationship of ab and cd given the following points

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