Pencils cost 25 cents apiece. Rulers cost 80 cents apiece. Susan spent $20 for a total of 36 rulers and
pencils. How many pencils did she buy?

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.