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A radioactive substance decays at an annual rate of 13 percent. If the initial amount of the substance is 325 grams, which of the following functions f models the remaining amount of the substance, in grams, t years later?
The number of cell phone users in North America has increased at an average rate of 4.6 percent per year since 2002. The number of cell phone users in North America in 2005 was approximately 7.2 million. Which of the following functions represents the number of cell phone users, C, in millions of people, t years since 2005?
A scientist observed a lab sample with 12 bacteria on December 1. The bacteria grew at an average rate of 16.4 percent per day. Of the following, which function represents the sample’s bacteria count, B, t days since December 1?
In the year 2000, there were 100,000 members left in a certain Asian fish population. Every year after 2000, when scientists surveyed the population, there were three-fourths the number of fish there were in the previous year. Which equation shows the relationship between n, the number of years since 2000, and p, the number of fish in the population?
Following an oil spill, the population of plankton in a certain part of the ocean is estimated over the course of thirty-six months, as shown in the table.
Which of the following best describes the relationship between time and the estimated population of plankton during the thirty-six weeks?
Sam opens a savings account with an 8% annual interest rate, compounded annually. She puts in $500 when she opens the account. If she doesn’t add or withdraw any more money, how much will be in the account in 10 years (please round your answer to the nearest dollar) ?