C. 160, 80, 40, 20 2. Write the first five terms of each sequence. Determine whether each sequence is
arithmetic, geometric, or neither.
a. a(1) = 7, a(n) = a(n − 1) – 3 for n > 2.2.4.3
b. b(1) = 2, b(n) = 2 · b(n − 1) - 1 for n > 2.
C. c(1) = 3, c(n) = 10 c(n - 1) for n > 2.
d. d(1) = 1, d(n) = n. d(n − 1) for n 2 2.

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

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