Answer:

1. 8 and 16, are 10, 12, and 14.

Step-by-step explanation:

Solution: a. If three arithmetic means will be inserted between 8 and 16, then a_1=8 and a_5=16 b. Using the formula for d, compute for the common difference. ... Thus, the three arithmetic means between the arithmetic extreme: 8 and 16, are 10, 12, and 14.

2. 21st term of the arithmetic sequence is 155.

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