PLEASE HELP WITH QUESTIONS IN THE SCREENSHOT (a, b,c) WILL MARK BRAINLIEST!

Which expressions are equivalent to -6 + 3m

In which form is the following function written? y = - 2(x – 3)(x + 5)

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: