40 points plzzz ! radium has a half-life of 1600 years. how much radium will be left from a 1000-gram sample after 1600 years?

A. what is the area of the base? use complete sentences to explain your reasoning. b. what is the volume of the prism? use complete sentences to explain your reasoning.

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2