Classify each polynomial based on the number of terms it contains.
-22-x+3.5
Monomial
Bini
10xyz
-2y2 + 2y
822 +0.25
xy + 2xy - 32

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.