2160 2040 1920 1800 1680- 1560- 1440 1320 1200- 1080- 960 10 15 20 25 30 The monthly salary S( t ) in dollars for a dock worker shown above has the following cubic model. S(t) = 0.182t3 – 7.87t2 + 103t + 988 where t is the number of years after 1980 Interpret S( 16 ) = 1366.75 O The monthly salary in 1996 was 1366.75. The salary in 1996 was 1366.75. The monthly salary in 1996 was $1366.75. Interpret S'(16) = - 9.06 O The monthly salary in 1996 was increasing by $9.06 per year. OThe monthly salary in 1996 was decreasing by $9.06 per year. The monthly salary in 1996 was increasing by 9.06. The monthly salary in 1996 was increasing by 9.06 per year. The monthly salary in 1996 was decreasing by 9.06. The monthly salary in 1996 was decreasing by 9.06 per year. O The monthly salary in 1996 was neither increasing nor decreasing.

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