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?
The expression 10(1 - 0.4)W finds the amount of radioactive substance remaining after w weeks.
10 * (0.6)^w
My apologies for the earlier incorrect response.
The statement "10 * (0.6)^w" correctly represents the amount of radioactive substance remaining after w weeks. The expression shows that the initial amount of 10 milligrams is multiplied by the factor (0.6)^w, where 0.6 represents the remaining 60% of the substance after each week. The exponent w represents the number of weeks, indicating how many times the substance decreases by 40%.