What is the answer to this question

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

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)

The correlation between height and weight for a certain breed of plant is found to be 0.75. what percentage of the variability in plant weight is not explained by height? 1-0.75 = 0.25 or 25% (b) )^2 = 0.5625 or 56.25% (c) )^2 = 0.4375 or 43.75% (d) (1 - 0.75)^2 = 0.0625 or 6.25%