Posted by **Jon** on Wednesday, April 9, 2008 at 9:10pm.

I need to find the future population using the model P=42+20ln(11t+1)

t= time in years

I need to find when it will be 180. I have my work below, but I am stuck. The answer I get is not right, it will not add up to 180. Maybe I am wrong some where.

P=42+20ln(11t+1)

180=42+20ln(11t+1)

-42 -42

(138/20)=(201n(11t+1)/20)

6.9=1n(11t+1)

e(6.9)=e^ln(11t+1)

e(6.9)=11t+1

-1 -1

[e(6.9)-1/11]=(11t/11)

t=[e(6.9)-1/11]

my wrong answer: 1.614193818

## Answer this Question

## Related Questions

- Pre-Calc (Follow-up with Bob Pursley) - For the below problem, I solved it as ...
- pre-calc - The city planners of bakersfield, CA are studying the current and ...
- Algebra Help please - In an experiment, a petri dish with a colony of bacteria ...
- religions - i need to make a model of any famous mosque in the world first, i ...
- Calculus - The population of a region is growing exponentially. There were 40 ...
- Algebra - I'm really stuck on these 2. Can you please explain the work clearly ...
- Exponential model - Hi, I have a exponential model of P = 5.3 x (1.11)^t. I need...
- Math Analysis - 31. Radioactive decay of material is determined using the ...
- Math - The population of a certain species of bird is limited by the type of ...
- College algebra - how do you find the population (in thousands) of people of a ...

More Related Questions