How many times smaller is 2 × 10 to the negative 8th power than 4 × 10 to the negative 7 power? A. 20
B. 200
C. 0.2
D. 2,000

Find the equation of the line with slope =8 and passing through (6,53) write your equation in the form y=mx+b

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

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)