Which shows a correct order to solve this story problem?

gina used 3.2 ounces of strawberry jelly and 4.7 ounces of raspberry jelly in her recipe. she made the same recipe 4 times.

how much jelly did gina use altogether?

a.
step 1: add the weights of the two jellies.
step 2: divide that sum by 4.

b.
step 1: subtract the weight of the strawberry jelly from the raspberry jelly.
step 2: multiply that difference by 4.

c.
step 1: add the weights of the two jellies.
step 2: multiply that sum by 4.

d.
step 1: subtract the weight of the strawberry jelly from the raspberry jelly.
step 2: divide that difference by 4.

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)