This table represents a quadratic function. Х
y
1
3
3
-3
5
-5
7
-3
9
3
Which statement about this function is true?
O A
The value of a is negative, so the vertex is a minimum.
OB
The value of a is positive, so the vertex is a maximum.
c.
The value of a is negative, so the vertex is a maximum.
OD
The value of a is positive, so the vertex is a minimum.

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)