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Pile Driver – Pier Foundation
publish date: 2026/05/05 08:08:37.375239 UTC
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A pile driver pounds poles into the ocean floor. Each strike sends a pole 6 inches deeper.
Find the depth of the pole after 20 strikes. Express your answer as a signed number in inches.
Correct Answer
-120 in
Explanation
\[ 20 \times (-6) = -120 \]
After 20 strikes, the pole is 120 inches (10 feet) below the ocean floor (\(-120\) in).
Reference
Mathematics for college students, go-math-science.com