Well, you already have the decay model, so just plug that in
It would be any number times 0 so yeah I hope this helps
Y - 2 +

Your teacher may also just want the answer y - 2 with a 7 remainder
Either way, you set it up like long division and solve as such.
Answer:
60
Step-by-step explanation:
50%=.50
160×.50=80
160+80=240
25%=.25
240×.25=60
60 is the final number
Answer:
-4 in
Step-by-step explanation:
4 inches underground, assuming that ground level is 0, is negative four inches.