What would be the radius r of a sphere of neptunium-237 that has a critical mass?

In a circle, a 45° sector has an area of 32π cm2. what is the radius of this circle? 32 cm 12 cm 16 cm 8 cm

Find the height of a square pyramid that has the volume of 32 ft.³ and a base lengthof 4 feet

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.