Rewrite the expression (x^3+2x^2-x) - (-x^3+2x^2+6)

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

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.

Name two numbers whos difference is -3