ASAP PLS AND SHOW SOLUTION

Refer to problem in question 5, how many hours will its mass be equal to one-fifth its original mass? A 6 hours B 6.7 hours C 6.30 hours D 7 hoursQuestion 5 QUESTIONS REMAINING 5 Points A hazardous material was found to decay at a rate proportional to the amount present. Initially, there were 80 mg of this radioactive material that was present. After two hours, it has lost 40 percent of its original amount. Find the mass of the material after 4 hours. A 30 mg B 35 mg 37 mg D 40 mg Question 6 5 Points Refer to the problem in question 5, what is the constant of proportionality? A -0.255 B -0.355 C -0.455 D -0.555 Questions Filter (15)Question 6 Refer to the problem in question 5, what is the constant of proportionality? A -0.255 B -0.355 C -0.455 D -0.555 Question 7 Refer to problem in question 5, What would be the mass of the material after 12 hours? A 3 mg B 4 mg C 5 mg D 6 mg