What is 3/8 + 1/4 please help me

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.

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

We just started the introduction into circles and i have no idea how to do this.