Aquarterback completes 65% of his passes. out of his next 40 passes, how many can you expect to be completed

I’m stuck on this i don’t understand.

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.

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled