1.what is the 50th term in the squence -7,-4,-1,-2?
2.find the first term in the squence in which a 15=40 and the common difference 15-2?
3.determine the 30th term if the 8th term is 14 and the 20th term is 21?
4.find the 16th term in the squence in which the first term is 0.5 and the common difference is 1.5?