If Sophia purchases games this weekend, everything is half price. She creates the expression below to represent the total cost for both games. Simplify the expression. ½(10.00 + 4.00r) + ½(7.00 + 3.00m)

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.