2uestion 11 (1 point) The amount of radioactivity that gets through a barrier decreases by 55% for every 3 cm of thickness that the barrier is. This process can be modelled by the exponential function P(.'L') 2 190(1)) %, where P0 is the initial amount, P(3) is the percent of radioactivity that gets through and SC is the thickness of the barrier in centimeters. Algebraically determine how thick a barrier must be if only 5% of the radioactivity can get through. Express your answer to the nearest tenth