Find the indicated term of each aithmetic sequence

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Find the indicated term of each aithmetic sequence
28th term; 0,-4,-8,-12 过程最重要.不然看了答案也不会算.

规律为：（-4）*（n-1）
第28项为：（-4）*（28-1）＝-108
再问：题目是第7题：28th term：0，-4，-8，-12，...
再答：你那是第7小题，对吧？ 7.
再问：对，希望可以发过程
再答：第一项（-4）*（n-1）＝（-4）*（1-1）＝0 第二项（-4）*（n-1）＝（-4）*（2-1）＝-4 第三项（-4）*（n-1）＝（-4）*（3-1）＝-8 …… 第28项（-4）*（n-1）＝（-4）*（28-1）＝-108
再问：规律一定是（-4）*（n-1）？还有这题呢？第九题：17th term；a的右下角有个1不知怎么打 a1=2.3；d=-2.3
再答： 17term 是负的。奇数项为正，偶数项为负，第17项为2.3

Find the indicated term of each aithmetic sequence If each term of the sequence (a1,a2,.,an) is either 7 or 77, 英语翻译2,-4,-8.In the sequence above,each term after the second 英语翻译Each new term in the Fibonacci sequence is generated by 翻译下 (a)The general term of a sequence is XXX .write down the SAT the first term of a certain sequence is -2 and the secon 3,5,-5,…The first term in the sequence of numbers shown abov sat数学题 The 3rd term of a geometric sequence is -3 英语翻译这句子是The n(th) term of a number sequence is given by form It is given that the nth term of a sequence is 2(n-1)/2.what find the slope of each line什么意思.谢谢..!~~ In the short term each of these sales means an injection of