Determine whether each relation is a function

Tell me how you got the it use the figures to answer questions 1and 2. in each diagram, line k is parallel to line l, and line t intersects lines. 1. based on the diagrams, what is the value of x? 2. how would you verify your answer for x?

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

Acircle has a circumference of 28.36 units what is the diameter of the circle