3.4 library of functions (#5-11)?

Find the total area for the regular pyramid ( follow the answer set up in the picture)

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.

I’m stuck on this equation, anyone got the answer?