Can someone pls give me the answer for this?

Select all the expressions that will include a remainder.

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.

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.