Solution: We are given the function $ P(d) = 3d + 7 $, and we are to compute the total number of microplastic particles from depth $ d = 1 $ to $ d = 10 $. This requires summing $ P(d) $ over integer values from 1 to 10:

Mon, 04 May 2026 05:56:08 +0000

**Why Understanding Microplastic Accumulation from Depth Matters—and What It Reveals** At what depth are microplastic particles most concentrated beneath Earth’s surface? Recent data analysis suggests a growing focus on how these microscopic materials accumulate from shallow waters to deeper soil layers—reaching as deep as 10 meters. This pattern reflects broader concerns about pollution and environmental persistence, especially as microplastics enter ecosystems far beyond visible waters. Understanding the total concentration of microplastic particles across distinct depth zones offers insight into contamination trends—particularly in groundwater