Question

I am not sure how to solve these problems :( can I get some help please?

Answer 1

4 years old

Explanation:

This requires solving equations with logarithms:

`P(x)=31=90/(1+271e^(-0.122x))` and we want to solve for `x`

Rewriting:

`1+271e^(-0.122x)=90/31`

`e^(-0.122x)=(90/31-1)/271`

`e^(-0.122x)=59/8401`

Take the natural logarithm of both sides:

`ln(e^(-0.122x))=ln(59/8401)`

`-0.122x=ln(59/8401)`

`x=(ln(59/8401))/-1.22`

`x=4.06`

Rounded to a whole number would be 4 years old.