An egg is dropped from a height of 90 ft. If acceleration due to gravity is -16 ft/s^2 and initial velocity is 0 ft/s, approximately how long will it take for the egg to reach the ground? A) 1.9 s
B) 2.4 s
C) 9.7 s
D) 40.7

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.