It should be for 5 hours if $30 is what they started with
Answer:

Step-by-step explanation:
To complete the square: add 4 to both sides because the product of 4 as 2 as the factor which 2 * 2 so 



Now we can factor the expression

Move the 4 to the other side to isolate y which changes the sign
G = - h/3 + 11/3
H = 11 - 3g
I hope this helps