Write the first 3 terms of each of the arithmetic sequence below.
First terms 30, sum of first three terms is 300

Write the first five terms of each of the sequences whose n^(th) terms are: a_n (n+2)

Write the first five terms of each of the sequences whose n^(th) terms are: a_(n) =n(n^2+5)/4

Write the first three terms of the sequence a_n=(-1)^(n-1)5^(n+1) .

Write the formula to find the sum of first n terms of an Arithmetic progression, whose first term is a and the last term is a_n .

Write the formula to find the sum of first n terms of an Arithmetic progression, whose first term is a and the last term is a_n .