Question 671828
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Hi,
what is the arithmetic sequence finding the 52th term
20,18,16,14 &#8658; d = -2  and {{{a[n] = a[1] + (n-1)d }}},{{{a[52] = 20 + (51)(-2) = 20-102 = -82 }}} 

Believe your 1st term to be 4
 4,-16,-36,-56 &#8658; d = -20 and {{{a[n] = a[1] + (n-1)d }}},{{{a[52] = 4 + (51)(-20) = 4-1020 = -1016 }}}