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Home > CCA > Chapter 10 > Lesson 10.2.3 > Problem 10-56

10-56.
  1. How many terms are in the arithmetic sequence shown below? Homework Help ✎

    15, 7, −1, −9, ... , −225

Write an equation for the arithmetic sequence using anm(n − 1) + a1

Let a sub n = −225 and solve for n.