I need help A biologist is studying the effects of using a type of bacteria to clear drain pipes. She creates a simulation of a typical kitchen drain system and uses it regularly for three days before introducing the bacteria. She then carries out her simulation for another 15 days. The population of bacteria can be approximated using function b, where d is the number of days since she started the experiment and is the bacteria population in hundreds.

Use this information to complete the statement.

The domain over which the bacteria population increases is ___ _< d _< ___.