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10-49.
  1. Find the sum of the arithmetic series below. Homework Help ✎

    1. 5 + 10 + 15 + 20 + … + 400

    2. 3 + 8 + 13 + 18 + … + 398

    3. 80 + 74 + 68 + 62 + … + 14

Find the sequence that describes the series.

t(n) = 5n

Find which term is 400.

(400) = 5n
80 = n

Find the sum using the formula from the Math Notes box.

16200

See part (a).

16040

See part (a).