An unknown substance weighs 30.02kg when it is first brought to the lab. After a week in the lab, a technician weighs it again and finds it weighs 10.23kg. Assuming the substance is decaying exponentially, calculate the decay factor from week to week. I cant get this one at all please help and show work if possible thanks!

The answer is 270 cars.you can do this by making a proportional relationship. for instance, 200 is the whole we are using, so on a “number line” 200 would be over 100%. now, since he sells 35% more, add 35% to 100% to get 135% on the other side of the “number line” on the bottom half, leaving the top half empty.cross multiply 200 by 135 then divide by 100 to get your answer. i hope this , if it did, , if you don’t mind, giving me brainiest! 200/100% } 200 • 135 /100 ? /135%