No.

(a) 3 = e^{-2k}: This could only be true if k is negative and
therefore N increases.

(c) 2/3 = e^{-2k}: This means that N decreases by a factor 3/2 in
2 days.

(d) *l*n(3/2) = -3k: This means that N increases by a factor 3/2 in 3
days and k is negative.

(e) *l*n(1/3) = -3k: This means N decreases by a factor 3 in 3 days.
Proceed