Chlorine is frequently used to disinfect swimming pools. The chlorine concentration should remain between 1.5 and 2.5 parts per million (ppm) for safe swimming. After a warm, sunny day only 80% of the chlorine may remain in the water, with the other 20% dissipating into the air or combining with chemical in the water.let f(t)=3(0.8)^t model the concentration of chlorine in parts per million cfter t days

C) about when will the concentration be 3.5ppm? What does that mean?

Question

Chlorine is frequently used to disinfect swimming pools. The chlorine concentration should remain between 1.5 and 2.5 parts per million (ppm) for safe swimming. After a warm, sunny day only 80% of the chlorine may remain in the water, with the other 20% dissipating into the air or combining with chemical in the water.let f(t)=3(0.8)^t model the concentration of chlorine in parts per million cfter t days

C) about when will the concentration be 3.5ppm? What does that mean?