What is the square root of 100

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.

What is negative 3/9 times negative 2/8 ?

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9