Task Three cell phone plans, A, B, and C, cach have a different flat monthly rate for the first 500 text
messages and a different constant rate for every additional message over 500.
These tables show the monthly charges for plans A and B when different numbers of messages
are sent
Plan A Cell Phone Charges
Number of Messages Total Monthly Charge
500
580
$66.00
$50.00
Plan B Cell Phone Charges
Number of Messages Total Monthly Charge
500
$45.00
580
$69.00
1
Scientific Calculator Graphing Calculator
Part A
Letting x represent the number of messages over 500, and y the total monthly charges, write
equations representing the charges for plans A and B. Then graph the equations for plans A and
B on the same coordinate grid.

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)