A small submarine starts its dive at sea level and descended 30 feet per minute. Which integer represents the submarines debt after seven minutes? a: -30 feet

b: -210 feet

c: 37 feet

d: 189 feet

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.