Ido not understand. just the top one.

If you roll two fair dice (one black die and one white die), in how many ways can you obtain a 4 on at least one die?

How to do this , and can some one explain

Deepak plotted these points on the number line. point a: –0.3 point b: – 3 4 point c: – 11 4 point d: –0.7 which point did he plot incorrectly?