Maths-
SAT
Easy
Question
Which of the following describes an exponential relationship between the pair of variables listed?
- For every 3-millimeter increase m in the thickness of a piece of glass, the intensity of light I traveling through the glass decreases by 20%.
- Each second s, a car’s speed C decreases at a constant rate of 10 meters per second.
- With every 33-foot increase in depth d below the surface of water, the pressure p on an object increases by 14.7 pounds per square inch.
- The depth d of water remaining in a reservoir decreases by 15 inches each minute m as the water is being pumped out at a constant rate.
The correct answer is: For every 3-millimeter increase m in the thickness of a piece of glass, the intensity of light I traveling through the glass decreases by 20%.
Constant rate → linear
Ratio, percent → exponential
So, option A describes an exponential relationship.
Option B, C, D are shows linear relationship
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