414 is 45% of what number

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

Solve the inequaliy: (x^2+2)(x−2)^2(6−2x)> 0

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.