Is 1,713,646 divisible by 8?

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

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.