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

Question

04-10-2021
Mathematics

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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

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icuberlsa icuberlsa · Answer 1 · 2021-10-04T21:50:49-04:00

icuberlsa icuberlsa

04-10-2021

Answer: Eric: The 10 is the initial amount, the 1/2 is the decay factor or the rate at which it decreases, and the exponent w is the number of weeks it decreases by factor 1/2, or the time. Andrea, 1 is the initial amount, 0.2 is the decay factor or rate of decrease, w is time passed or number of weeks it's decayed by the factor.

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