You would start your graph at (1,7.5) (2, 15) (3, 22.5) (4, 30) (5, 37.5)
Step-by-step explanation:
What you do is for every hour you add 7.50. I don' know how many hours you need to graph so I just gave you the first five, But you should start to see a pattern, just continue with the pattern and you will get it right! Hope this helps!
and minimum value of f(x) is 12