16. If the series is represented by the summation , 3x + 2, what is the first term (a1)? C. 7 А. 3 В. 5 D. 8 17. If the series is represented by the summation , 3x + 2, what is the fifth term (as)? С. 17 А. 8 В. 15 D. 21 18. If the series is represented by the summation E1 3x + 2, what is the sum of all the ter =D1 C. 45 А. 25 В. 35 D. 55

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