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1.a Write an equation for y, the amount of oil remaining in the well at any time t.

Attempt at solution:

y=y0e^(kt)

I know I need to solve for k, I just don't know how.

At t=0, y0=1,000,000

t=6 (Half life=??)

1. b At what rate is the amount of oil in the well decreasing when there are 600,000 gallons of oil remaining?

solution: haven't quite gotten here yet...

1. c In order not to lose money, at what time t should oil no longer be pumped from the well?

solution: see above. :-(

Thank you to anyone who can point me in the right direction, here.