Plz I need this answer by today.

Simplify the expression 6h + (8.9d) - 17 + 6d - 2.4h

Which of the following points is collinear with (-2,1) and (0,3)

The value of cos 30° is the same as which of the following?

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.