The total height of Bill, Mary, and Rob is 180 cm. Rob is twice as tall as Bill and Mary is 28 cm taller than Bill. How tall is Rob?

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

Atoy company is considering a cube or sphere-shaped container for packaging a new product. the height of the cube would equal the diameter of the sphere . compare the volume to surface area ratios of the containers. which packaging will be more efficient? for a sphere, sa =4πr²

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5