Pre-calculus help please if vector u has its initial point at (-7,3) and its terminal point is (5,-6), u=?i+?j. if v=-11i+3j, 2u-v= ?i+?j

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.