Sodium-24 (24Na) is a radioisotope used to study circulatory dysfunction. A measurement found 4 micrograms of 24Na in a blood sample. A second measurement taken 4 hrs later showed 3.33 micrograms of 24Na in a blood sample. Find the half-life in hrs of 24Na. Round to the nearest tenth.

The map shows the location of the airport and a warehouse in a city. though not displayed on the map, there is also a factory 112 miles due north of the warehouse.a truck traveled from the warehouse to the airport and then to the factory. what is the total number of miles the truck traveled?