The daily supply of oxygen for a particular multicellular organism is provided by 625 square feet of lawn. A total of 12,500 square feet of lawn would provide the daily supplies of oxygen for how many organisms? The lawn would supply the daily supply of oxygen for __ organisms.

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.