Two spheres are cut from a certain uniform rock. One has radius 4.50 cm. The mass of the other is five times greater. Find its radius. A. 22.5 cm. B. 6.36 cm. C. 0.90 cm. D. 7.69 c

Vol of sphere = 4/3 pi r^2. density of sphere = mass/volume. mass = densityxvolumesphere 1. mass = density x 4/3 pi 4.5^2sphere 2 5mass = density x 4/3 pi r^25=4/3 pi r^2 divided by 4/3 pi 4.5^25=r^2 divided by 4.5^25x4.5^2=r^2root (5x4.5^2) = r4.5 root 5 = r