Nick starts with 20 milligrams of a radioactive substance. The amount of the substance decreases by each week for a number of weeks, w. He writes the
expression 20(3)" to find the amount of radioactive substance remaining after w
weeks.
Autumn starts with 1 milligram of a radioactive substance. The amount of the
substance decreases by 5091 each week for a number of weeks, w. She writes the
expression (1 – 0.5)" to find the amount of radioactive substance remaining after w
weeks.
Use the drop-down menus to explain what each part of Nick's and Autumn's
expressions mean.