Answer the question I took a picture of

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

3/4 = c/36 i need with this fraction proble.

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.