Really just learning the stuff can you help me with X over negative 6 less than or equal to 8

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)