Demarco starts with 10 milligrams of a radioactive substance. The amount of the substance decreases by 40% each week for a number of weeks, w. The expression 10(1 – 0.4)w finds the amount of radioactive substance remaining after w weeks. Which statement about this expression is true?
CLEAR CHECK
It is the initial amount raised to the decay factor after w weeks.
It is the difference between the initial amount and the decay factor after w weeks.
It is the product of the initial amount and the decay factor after w weeks.
It is the difference between the initial amount and the percent decrease.
The correct statement about the expression 10(1 – 0.4)w is:
It is the product of the initial amount and the decay factor after w weeks.