Eric starts with 10 milligrams of a radioactive substance. the amount of the substance decreases by 12 each week for a number of weeks, w . he writes the expression 10(12) 10 ( 1 2 ) w to find the amount of radioactive substance remaining after w weeks. andrea starts with 1 1 milligram of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w . she writes the expression (1−0.2) 1 - 0 . 2 w to find the amount of radioactive substance remaining after w weeks. use the drop-down menus to explain what each part of eric’s and andrea’s expressions mean.