What Is the volume of the pyramid in the diagram?

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

8.74 rounded to the nearest whole number

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: