Eric starts with 10 milligrams of a radioactive substance. The amount of the substance decreases by 12 each week for a number of
2 answers:
Answer and explanation:
Eric's expression is and Andrea's is
.
In Eric's expression, 10 represents the amount of substance he begins with. 1/2 is the amount of substance left after each time period (in this case, each week).
Andrea's expression can be written as . The one outside of parentheses represents the initial amount of the substance. The one inside of parentheses represents 100% of the original amount of the substance. 0.2 represents the 20% of the substance that is lost each time period. The variable w in this case represents the number of weeks.
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