November 25, 2015

Homework Help: Math

Posted by Jake on Saturday, January 28, 2012 at 9:34pm.

How do I solve this if there is no equation to this

1. The population of the bacteria in a Petri dish increases by a factor of 10 every 10 hour. If there are initally 20 bacteria in the dish, how long will it take before the population increases to 60,000 to the nearest tenth of an hour?

a) 3000.0 h
b) 300.0 h
c) 4.8 h
d) 3.5 h

2. A certain radioactive isotope has a half life of 5 years. If a sample has 120 grams of radioactive material, what equation could be used to determine the amount of material remaining (y) after x years.

a) y=120x(1/2)^5x
b) y=60^5x
c) y=120x5^1/2x
d) y=1/2x120^5x

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