Please help i don't know this

Given the graph below state whether or not the relation is a function, and give the domain and range.

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

2x + 1 < 5 solve the following inequality. then place the correct number in the box provided.