An electronics store receives a shipment of 35 graphing calculators including 7 that are defective. eight calculators are chosen at random to be sent to a local high school. 8. how many total selections can be made?

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.