Final answer:
Without the explicit functions f(x) and g(x), we cannot determine the exact value of f(4) + g(3). We only know from the information provided that g(3) might be equivalent to G, which is equal to 331.25. The value of f(4) is unknown, preventing us from calculating the sum.
Step-by-step explanation:
To find the value of f(4) + g(3), we need to know the specific functions f(x) and g(x).
However, based on the provided information, we cannot determine f(x) and g(x) directly. We do have a set of equations and some context which might be related to g(x), specifically an equation where G is isolated:
3500 = 400 + 0.85(3500 - 0.25(3500)) + 300 + G + 500 - 0.1(3500 - 0.25(3500))
G = 331.25
If we assume that G represents g(3) and it equals 331.25, we still do not have the value of f(4) to add to it.
Without additional information or a functional form for f(x), it is impossible to calculate f(4) + g(3).
If the information about f(x) was provided in a format we can interpret, we would use that to find f(4) and complete the calculation.