Help i need help i will mark you as brainiest if your answer is right

Factor the polynomial expression x6 – x3 – 20

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:

If a + b = 4, what is the value of |4 – a| + |4 – b|?