Which phrase is correct?
- Two lines of length 9 cm and 10 cm.
- Two lines of lengths 9 cm and 10 cm.
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The plural would be correct. "We have two materials of dielectric constants 7 and 8." The nouns should agree with the plural verb "have". So you "have materials...of constants...".
And the original sentence> "The transistors, 10 cm and 9 cm long, have demonstrated a linear change of 50% and 76%, respectively."
Hope that helps.