A cylindrical cup of water has a mass of 300g. Just the cup weighs 50g. If the glass has a radius of 3in and a height of 6in. What is the density of the water? Round to the nearest hundredths. Please Help ASAP!!!

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

Find the area of an equilateral triangle with a side of 6 inches

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)