The value of y varies directly with x. which function represents the relationship between x and y if y = 20/3 when x = 30? a) y = 200 x b) y = 2/9 x c) y = 110/3 x d) y = 9/2 x

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.