Question

Suppose that a bacterial culture was known to double every 2 days. After 46 days, it covered the entire surface area in the petri dish. When did it cover half the area? Explain.

Answer 1

in day 44 it covered half the area.

Explanation:

A bacterial culture doubles every two days, so if today it covers
`3 cm^2`, in two days it will cover
`6cm^2`. In other words, if today it covered x space, two days ago it covered half the space
`((x)/(2))`.

Now, following that reasoning, we have that after 46 days the bacterial culture covered the entire surface area in the Petri dish, therefore, two days ago it covered half the area and we can conclude that in day 44 it covered half the area.