Solving multi-step equations
14. 4(2a+2)-17= 15
16. -4x+3(2x-5)= 31
17. -6-3(2k+4)= 18
22. 2x+ 3/4(4x+16=7

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.