Ireally need it’s long but i will be greatly appreciated if you could me all the way through

What is the range of the data below? .8090100

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Apassenger train and a freight train leave san jose at 3pm, traveling in the same direction. the passenger train is going three times as fast as the freight train. at 6pm they are 240 miles apart. how fast is each travelling? explain your answer and show your