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6-18.
  1. What is the missing term in each sequence? Homework Help ✎

  2. a.


    Hint: This is an arithmetic sequence.

    b.

Review the Math Notes box in section 5.3.2

Note that there are terms missing in the table.
a1 = 1 while a5 = −7.
What is the common difference?

Review the Math Notes box in section 5.3.2
Is this Arithmetic or Geometric?

This is a Geometric sequence.

So r = 1.8

a4 = a3 · 1.8

a4 = 32.4 · 1.8

a4 = 58.32