A rumor spreads exponentially through a school, so that the number of people who know it can be modelled by the equation N=Ae^kt, where t is the time, in minutes, after 9 am. When school begins at 9 am, 18 people know the rumor. By 10 am 42 people know it. Show that k=0.0141, correct to three significant figures.

Mrs. gehrke said cheddar weighs 16.8 pounds. he actually weighs 15.2 pounds. what is the percent error?

Create a question with this scenario you could ask that could be answered only by graphing or using logarithm. david estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x.

The price of a dozen eggs was $1.63. suppose the price increases m dollars per dozen and then the price decreases $0.12 per dozen. which expression represents the current price of eggs after the two price changes?