volume_mute
Oceanography – Submersible Depth
publish date: 2026/05/05 08:08:36.476577 UTC
volume_mute
Scientists lowered a submersible into the Pacific Ocean to record water temperature. The first measurement was made 75 feet below sea level, and more were made every 75 feet after that.
Find the depth of the submersible when the 25th measurement was made. Use a signed number.
Correct Answer
-1,875 ft
Explanation
Each measurement is made 75 ft deeper, so the depth is a repeated addition of \(-75\). Using multiplication:
\[ 25 \times (-75) = -1{,}875 \]
The integers have different signs, so the result is negative. The submersible was 1,875 feet below sea level.
Reference
Mathematics for college students