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Answer:

To find the sum of the first 20 terms of an arithmetic sequence, we can use the formula:

Sn = n/2(2a + (n-1)d)

where Sn is the sum of the first n terms, a is the first term, d is the common difference, and n is the number of terms.

Substituting the given values, we get:

S20 = 20/2(2(5) + (20-1)3)

S20 = 10(10 + 57)

S20 = 670

Therefore, the sum of the first 20 terms of the arithmetic sequence is 670.

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