I belive it would be y=-5/1x+6?
But im only like 90% sure so dont take my word for it but i hope that right?
I think you do 120 divided by 5, but I could be wrong.
100p? if you would like to explain what the variable p is i could help out
Answer:
The function show the value of the machinery after "t" years.
So After "4" years... Input "t" as 4 to get its value
f(t) = 12,500 - 1,600(4)
=$6,100
OPTION C IS LEGIT!!!