How do i solve this i am very confused

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Which equation represents h for right triangle abc

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: