Answer: x = 27
Step-by-step explanation:
F(x+1) = f(x) + 2.5 with f(x) is the current number.
That would be 40 I think if you are talking about the green area
Solution:
we are given that
A student has some $1 and $5 bills in his wallet.
Let there x $1 bills and y number of $5 bills.
He has a total of 14 bills that are worth $34.
So we can write


Now solve these two equations together using substitution as follows

Hence there are 9 $1 bills and 5 bills are of $5.