41-19 is 22 so he has 22 nickels. The amount of dimes is put in there to distract you. Just ignore those! :)
Answer:
in graph A the vertex is (0,0)
in graph B the vertex is (0,3)
in graph C the vertex is (0,-3)
And in graph D the vertex is (0,-1)
The axis of symmetry for all of the is 0
And i don't remember maximum and minimum sorry