Answer:
Assuming you have 
with 
, the answer is f(2)=13.6.
Step-by-step explanation:
I think that says with .
Now we want to find 
so replace n with 2:
This gives you:
Answer:
12
Step-by-step explanation:
x = number of $1 bills
y = number of $5 bills
z = number of $10 bills
We know that:
x + y + z = 25 (total amount of bills)
x + 5y + 10z = 100 (total amount of money)
y = 4z (Given)
Substitute the third equation into the first one.
x + 4z + z = 25
x = 25 - 5z
Put this into the second equation.
(25 - 5z) + 5 (4z) + 10z = 100
Simplify and solve.
25 - 5z + 20z + 10z = 100
25z + 25 = 100
25z = 75
z = 3
Substitute this into y = 4z
y = 4 * 3
y = 12
So, there are 12 $5 bills.
Theres information missing in the question. There should be one more pair of coordinates
Just do 45x0.2 then take that number off of $45 thats your answer
