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a)Let x be the amount of Kool-Aid, in kilograms, in Lake Alpha t hours after the crash. Find a formula for the incremental change in the amount of Kool-Aid, DeltaX, in terms of the amount of Kool-Aid in the lake x and the incremental change in time DeltaT.

b) Find a formula for the amount of Kool-Aid, in kilograms, in Lake Alpha t hours after the crash.

c)Let y be the amount of Kool-Aid, in kilograms, in Lake Beta t hours after the crash. Find a formula for the incremental change in the amount of Kool-Aid, DeltaY, in terms of the amounts x, y, and the incremental change in time DeltaT.

d) Find a formula for the amount of Kool-Aid in Lake Beta t hours after the crash.

I only tried a and b.

for a i got:

DeltaX = (0.25 - x/800)*DeltaT

b)

x(t) = 200 - 200e^(-t/800)

But these are both wrong according to the database.