This is my work are the answers correct and if I’m not please correct me. 7.50 This represents basically their money and time

8.Y=90x+50

9.75

10.260 looking at the problem, I simply went back to number nine, saw how long they stayed and how much they spent and divided it and got 6.25. I then saw how much they spent overall on this problem divided 1625 by 6.25 and got 260 nights

11.75

12.600

13.Y=2/3x+600

14 looking at the problem it would take 72 months because every three months the tree grows two inches so 30x 2 +12=72

15.690 in