HELP What is the equation for the line of symmetry in this graph?

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.

At which value in the domain does f(x) =0?

How to find the volume of an area and height