Write an Equation That Expresses the Relationship

question 20

Multiple Choice

Write an equation that expresses the relationship. Use k as the constant of variation.
-The intensity I of light varies inversely as the square of the distance D from the source. If the intensity of illumination on a screen 36 ft from a light is 3.9 foot-candles, find the intensity on a screen 90 ft from the light.

• A) 0.624 foot-candles
• B) 1.56 foot-candles
• C) 9.75 foot-candles
• D) 24.38 foot-candles

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Definitions:

Compounded Annually

Interest calculation method where interest is added to the principal at the end of the year, affecting the total interest earned or paid.

RRSP

Registered Retirement Savings Plan, a Canadian account for holding savings and investment assets, with certain tax benefits.

Compounded Semi-annually

The technique of twice yearly adding interest to the initial sum of money and to the interest that has previously been compounded.

End-of-quarter Payments

Payments made at the end of each quarter in a financial year, often related to dividends, loans, or leases.