How do you solve this?

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

If x varies directly as y, and x = 7.5 when y = 10, find x when y = 4

Nour and rana are shopping for a christmas tree. they are deciding between 2 22 different types of trees (real and fake) and 4 44 colors for the ornaments (white, silver, gold, and purple). they each created a display to represent the sample space of randomly picking a type of tree and a color for the ornaments. whose display correctly represents the sample space?