Which relation is also a function? O A. x 5 10 20 10 25
y 10 5
15 15 20
O B. {(3,6), (6,3), (3,9), (15, 12),
(9, 12)}
O C.
2 3
4
O D. {(6,3), (3,6), (9,6), (12, 15).
(12, 9)}
2nd question of my test plz help I need bad

What signals you that factoring by grouping is the best method to use when factoring a problem?

Write the equation in logarithmic form 8^x=64

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)