Eric starts with 10 milligrams of a radioactive substance. the amount of the substance
decreases by each week for a number of weeks, w. he writes the expression
10(1)" to find the amount of radioactive substance remaining after w weeks.
andrea starts with 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)" 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.