Originally Posted by

**rachael** 13 The volume of chlorine, C litres, in a swimming pool at time t hours after it was placed in

the pool can be modelled by C(t) = C0ekt, t ≥ 0. The volume of chlorine in the pool is

decreasing. Initially the volume of chlorine in the pool was 3 litres, 8 hours later the

volume was 2.5 litres.

a State the value of C0.

b Find the exact value of k.

c Exactly how many litres of chlorine were present in the pool 16 hours after the

chlorine was added to the pool?

i need help on c. how would i do this question.

i sub t=16, Co=3 in the equation but do know what to do next.