Math Problem Statement
The sum of the first 40 terms of an arithmetic sequence is 3220. The first term is 2.5. Find the common difference.
Solution
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Math Problem Analysis
Mathematical Concepts
Arithmetic Sequences
Sum of Arithmetic Sequences
Formulas
Sum of an arithmetic sequence: S_n = (n / 2) * (2a + (n - 1)d)
Theorems
Arithmetic Series Formula
Suitable Grade Level
Grades 9-10
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