This is exponential decay of the form:
f=ir^t, f=final value, i=initial value, r=rate, t=time in this case:
V(t)=408000((100-18)/100)^t
V(t)=408000(0.82)^t so
Vo=408000 and b=0.82
....
V(8)=408000(0.82)^8
V(8)=$83400.95 to nearest cent
Answer: Our required answer will be

Step-by-step explanation:
Since we have given that

We need to get the difference:
1) We first open the second bracket and make appropriate change in signs :

2) Gather the like terms together :

Hence, our required answer will be

#3
250 for onetime set up fee and for every jersey so 250+35x is the equation
You are 16 or 16 and a half about to be 17