What is the general form of the equation for the given circle centered at o(0, 0)?

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?