7
QuizMultiple Choice

Modeling with Sequences and Series — Unit test

Question 7 • 2025-2026 FBISD - Precalculus B (CR)

A marine biologist is setting up a net 6 feet below the surface of the water. Each foot of the water screens out 40% of the light coming from the surface. Which of the following is the approximate percentage of light remaining after passing through 6 feet of water, to the nearest tenth of a percent?

Answer
A
0.4%
B
1.0%
C
4.7%
D
7.8%

Explanation

If each foot screens out 40% of the light, then 60% remains after each foot. After 6 feet, the remaining fraction is 0.60⁶ = 0.046656. Converting to a percentage gives about 4.7%, so the answer is C, 4.7%.

AI-written and checked against the verified answer.

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