The Life Expectancy E , in Solar Lifetimes, of Certain $E = M ^ { - 25 }$

question 5

Multiple Choice

The life expectancy E , in solar lifetimes, of certain stars depends on their mass M , in solar masses. The relationship is $E = M ^ { - 25 }$ As mass increases, life expectancy decreases. What can you say about the rate of decrease? A graph of E versus M can help you answer this question.

• A) Life expectancy decreases at a decreasing rate.
• B) Life expectancy decreases at an increasing rate.
• C) Life expectancy reaches a point of inflection.
• D) None of the above.

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Definitions:

Revolving Line

A type of credit that does not have a fixed number of payments, in contrast to installment loans; credit is automatically renewed as debts are paid off.

Annual Interest Rate

The percentage of interest that is charged or earned on an investment or loan over the course of a year.

Revolving Line

A credit arrangement that allows a borrower to use or withdraw funds up to a designated limit, repay them, and borrow again.

Simple Interest

A method of calculating interest where the interest charge is based only on the original principal, not on the interest which has been added over time.