Jamar deposited $200 into a savings account. The account earns 2.5% annual compound interest. If your mom makes no additional deposits or withdrawals, how much interest will he have earned at the end of 20 years?

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.