Question

The mass of a bacterial culture doubles every 4 days. If the initial sample is 5 mg: a) How much will you have after one week (7 days)? b) How long does it take to reach a mass of 320mg?

Answer 1

For me i got this. A) = 16.846mg B) 24 days I am also in summer school for toronto schoolboard. I used the formula like how it said so should be good.

Explanation:

A)

`P(t) = Po(2)x^(t)/(d) \\=5(2)^(7)/(4) \\=16.817mg`

B)

`320=5(2)^(t)/(4)\\ 64=2^(t)/(4)\\2^6=2^(t)/(4)\\6=(t)/(4)\\(4)6=t \\t=24 days`