Please, I need help! What's 4000/4*10^-5 (Can someone add the steps also because I dont understand how to do it either)

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?

Your friend, taylor, missed class today and needs some identifying solutions to systems. explain to taylor how to find the solution(s) of any system using its graph.