Eric starts with 10 milligrams of a radioactive substance. The amount of the substance
10(%)" 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
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.
decreases by % each week
for a number of weeks, w. He writes the expression
number of weeks, W. She writes the