How do you express the area of a circle as a monomial?

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?

The population in a city is modeled by the equation p(d)= 100,000*(1+0.3) where d is the number of decades since 1970

Lauren has five shells she found on the beach seashells represent one-third of the shells her whole collection how many shells does lauren have in her whole collection