Division i need with division will you me?

In the diagram below what is the approximate length of the minor arc ab

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 this inequality notation? t is less then or equal to 2