i have tried using A=Pe

^{rt}to solve this, but im a little lost do i convert the growth rate(r) to 0.065? should i be using a different forumla instead?

2. If the population of bacteria doubles every 30 min, how long would it take for the population to triple?

I decided to start with 100 bacteria and follow the A=Pe

^{rt}formula. Still not sure the format for r. But i did something like the lesson on exponential word problems with. just like thinking about it you would assume 45 mins but i don't know how to do it mathematically other then

300=100e

^{0.5t}

3=e

^{0.5t}

ln(3)/0.5=t

t=2.197

THis as my attempt at it and its probably very wrong.

Of course if the format for r i have used is wrong then the answer will be wrong. Also i need to rearrange the A=Pe

^{rk}formula for time after i have found the constant, and im stumped on what it should look like.

thanks