Total distance divided by total time is called what?

Plz help plz give me the answer

What is the value of the expression below? 148+(-6)| + |– 35= 7|

What will the graph look like for a system of equations that has no solution? a. the lines will be perpendicular. b. the lines will cross at one point. c. both equations will form the same line. d. the lines will be parallel.