Question 1145929
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I'll give you a bit of help so that YOU can find the answers to the questions....<br>
(a) The n-th term is the difference between the sum of the first n terms and the sum of the first (n-1) terms.  Both those sums are given to you.<br>
(b) The difference of 56-48=8 between the 3rd and 5th terms allows you to determine the common difference between terms.<br>
Now you know the 3rd and 5th terms (given), the n-th term (from part a), and the common difference (from part b).  That allows you to completely determine the sequence, allowing you to answer the remaining questions.