Question

Please can you help me to do this problem please.

Answer 1

This situation is represented by an exponential function since it increases double every 4 hours

It has an initial value of 90 pounds of algae:

`\begin{gathered} 12\text{ hours have 3 periods of 4 hours, then} \\ \text{Exponential function is represented:} \\ y=ax^n \\ a=\text{initial value} \\ x=\text{common ratio} \\ n=\text{period} \\ \end{gathered}`

So,

`\begin{gathered} y=90(2)^3 \\ y=90(2)^3 \\ y=720\text{ pounds} \end{gathered}`