Answer:
The value of the car will be 
Step-by-step explanation:
we know that

so
Let
x-----> the value of the car after 11 years

Do $8.31/3 and $12.95/5 and that will give you a price per pound and whichever is cheaper would be a better deal.
Original height of tree = (x+5) m
In triangle ABC x square = 5 square + 12 square
X square = 25+144
X square = 169
X = 13
Thus the original height of the tree was 13+15 = 18m