I don’t understand how to find SN? Can someone help please?

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.

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct

Amachine part consists of a half sphere and a cylinder, as shown in the figure. the total volume of the part is π cubic inches.