Question 1 is equilateral
Question 2 is regular
Question 3 I don't know because I don't have a graph and there isn't one in the picture.
Question 4 Don't know because there is no graph.
Question 5 Don't know because there is no graph.
Sorry for the inconvenience of the graph stuff...
But I hope what I did with 1 and 2 helped!!!
-EmmyLou2020