Luis has $100 in savings and adds $75 more each week. Daniel has $80 in savings and adds $80 more each week. a.) After how many weeks, will Luis and Daniel have saved the same amount?

b.) How much money will they have saved?

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.