QUESTION 2 2.1 Calculate the number of terms in the following arithmetic sequence:
6; 1; -4; -9; ..; -239

2.2 The 3rd term of a geometric series is 18 and the 5th term is 162. Determine the sum of the first 7 terms, where r <0

2.3 The first term of a geometric sequence is 9. The ratio of the sum of the first eight terms to the sum of the first four terms is 97:81. Determine the first THREE terms of the sequence, if all the terms are positive.