Identify the domain of the table of values shown

1. are the triangles similar and if so why? what is the value of x? show your work.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

Marcus and cody both leave the park at the same time, but in opposite directions. if cody travels 6 mph faster than marcus and after 4 hours they are 64 miles apart, how fast is each traveling? solve using rare times time = distance.