How to explain the value of 4 in 6400 and 402

The conversion factor relating feet to meters is 1 ft=0.305 m. keep in mind that when using conversion factors, you want to make sure that like units cancel leaving you with the units you need. you have been told that a certain house is 164 m2 in area. how much is this in square feet?

What is the equation of a line passing through the point (6,1) and parallel to the line whose equation 3x=2y+4

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