its a c problem

A colony of bacteria has 6.5 x 10^6 members at 8 A.M. and 9.75 x 10^6 members at 10:30 am. Find its population at 12: PM

i got 1.105 x 10^7

but i want to make sure if its correct

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- Apr 26th 2010, 08:42 PMlightstevooC problem exponential growth and decay
its a c problem

A colony of bacteria has 6.5 x 10^6 members at 8 A.M. and 9.75 x 10^6 members at 10:30 am. Find its population at 12: PM

i got 1.105 x 10^7

but i want to make sure if its correct - Apr 26th 2010, 09:09 PMlightbanders
Your answer is incorrect lightstevoo. The correct answer is 1.24 x 10^7. Try using the formula the teacher was suppose to supply to you. GOOD LUCK

- Apr 26th 2010, 09:11 PMlightstevoo
- Apr 26th 2010, 09:15 PMlightbanders
Mr. Lightstevoo with all respect but how can u know who I am? That answer is correct

- Apr 26th 2010, 09:22 PMlightstevoo
emm... mr. Banders Baburto... with all due respect you are aware that you have copied some parts of my ussername. Considering this fact... you should realize that copying my username was not a mere miracle or a coincidence.

Good Luck with helping solve the problems. - Apr 27th 2010, 05:20 AMWilmer
We have: 6500000 to 9750000 in 5 half-hour periods; 6500000 to K in 8 half-hour periods.

6500000(1 + r)^5 = 9750000 ; solve to get r : [~.08447]

K = 6500000(1.08447)^8 = ~12435389 : hence ~1.24 * 10^7 is CORRECT.

Note: Perhaps I should change my name to "Lightswitch" !