A scientist begins with EDD grains of a radioactive substance. After 21D minutes= the sample has decayed to 4D grams. To the nearest hundredth of a minute, what is the halflife of this substance? : minutes The half life of a radioactive substance is 1577 years. What is the annual decay rate? Express the percent to 4 significant digits. TIP Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for InfinityAweeden artifact from an archeological dig contains 23 percent of the carbon-l4 that is present in living trees. To the nearest year= about how man").r years old is the artifact? {The halflife of carbon14 is 5T3D years.) See Enter your answer as an integer er deeimal number. Examples: 3, 41-, 5.5172 Enter DNE' fer Dues Net Exist; on for Innity A research student is working with a culture of bacteria that doubles in size every twenty minutes. The initial population count was 4 bacteria. Write an exponential equation representing this situation. Use t to represent hours. If you use the exponential function Poek, round your value for k to 4 decimal places. P(t) = Preview To the nearest whole number, what is the population size after 2 hours? bacteria Points possible: 1 License This is attempt 1 of 3