Answer:
Step-by-step explanation:
You need two years to solve the unknowns in the base equation.
Equation
C(x) = b*a^x
C(x) = cost in any given year.
b = base number
a = exponential base
x = number of years from 1998
Solution
x = 9 [2007]
C(x) = 119789
x = 4 [2002]
c(x) 108497
119789 = b*a^9
108497 = b*a^4 Divide (Cancelling out bs)
119789/108497 = a^(9 - 4)
1.0335538 = a^5 Take the 5th root of both sides.
1.006622462 = a
================
108497 = b*1.006622462^4
108497 = b*1.026754154
108497/1.026754154 = b
105669 = b
============
1999 would make x = 1
C(1) = 105669 * 1.006622462^1
C(1) = 106369.68
