Posted by Deborah on Thursday, January 24, 2013 at 10:18pm.
2. Suppose that the amount of algae in a pond doubles every 4 hours. If the pond initially contains 90 pounds of algae, how much algae will be in the pond after 12 hours?
A.)720 pounds
B.)360 pounds
C.)1,440 pounds
D.)114 pounds
I think the answer is D.
Please help.
Thank You.

Chemistry  Ms. Sue, Thursday, January 24, 2013 at 10:38pm
How on earth did you get 114 lbs.???
At the end of 4 hours >> 90 * 2 = 180 lbs.
At the end of 8 hours >> 180 * 2 = 360 lbs.
At the end of 12 hours >> 360 * 2 = 720 lbs.

Chemistry  Deborah, Friday, January 25, 2013 at 6:22pm
Thank you  just misread the question...
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