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Mazyrski [523]
2 years ago
15

Ariana starts with 100 milligrams of a radioactive substance. The amount of the substance decreases by 20% each week for a numbe

r of weeks, w. The expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. Which statement about this expression is true?
A-It is the difference between the initial amount and the percent decrease.



B-It is the difference between the initial amount and the decay factor after w weeks.



C-It is the initial amount raised to the decay factor after w weeks.



D-It is the product of the initial amount and the decay factor after w weeks.
Mathematics
1 answer:
Kruka [31]2 years ago
6 0

Answer:

  D.  It is the product of the initial amount and the decay factor after w weeks.

Step-by-step explanation:

We are told that Ariana starts with 100 milligrams of the substance. The number 100 in the expression likely represents this amount, <em>the initial amount</em>. It is multiplied by another number, so is part of a product. (It is not part of a difference, and is not something that is raised to a power.)

The factor (1 -0.2) represents the fraction remaining at the end of a week. That number raised to the power w will represent the fraction remaining at the end of w weeks. This fraction can reasonably be referred to as "the decay factor after w weeks."

Hence, the expression represents ...

  <em>the product of the initial amount and the decay factor after w weeks</em>

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