For a Certain Culture the Equation $Q ( t ) = Q _ { 0 } e ^ { 0.4 t }$

Short Answer

For a certain culture the equation $Q ( t ) = Q _ { 0 } e ^ { 0.4 t }$ , where Q 0 is an initial number of bacteria and t is time measured in hours, yields the number of bacteria as a function of time. How long will it take 700 bacteria to increase to 2,800? Please enter the answer as a number without the units and round to the nearest tenth. __________ hours