Question

Given: ________, – 243, – 226, – 209, – 192, – 175, …
The 67th term of the sequence is __________.
The series of the first 27 terms of the sequence is __________.

Answer 1

looks like an arithmetic sequence with d = 17
and term2 = -243
a+d = -243
a = - 260

term(67) = a+66d
= -260 + 66(17)
= ...

you should have at your finger-tips the formulas for the sum of n terms
you have the a and the d, so plug in