6(5x² + 3x + 5) – 4(7x2 + 3x + 4) equals?

Basically just need it simplified.

For which pair of functions is (gof)(a)=|a|-2?

If the value of cos330°is√3/2 then find cos 165°.

Plzz ! if you were constructing a triangular frame, and you had wood in the length of 4 inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no? = explain your mathematical thinking/show your work: