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 waites the
expression 20(*)" to find the amount of radioactive substance remaining atter w
weeks.
Autumn starts with 1 milligram of a radioactive substance. The amount of the
substance decreases by 50% 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,
CLEAR
CHECK
Nick's Expression: 20(3)"
2:
w:
20:
(1)":
Autumn's Expression: (1 - 0.5)
w:
0.5:
1 -0.5: