SOLUTION: 4 ,1 ,-2
Which term of the sequence is equal to -143
Algebra.Com
Question 841148: 4 ,1 ,-2
Which term of the sequence is equal to -143
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
First term: a1 = 4
Common Difference: d = -3
nth term:
an = a1 + d(n-1)
an = 4 + (-3)(n-1)
an = 4 - 3n + 3
an = -3n + 7
Plug in an = -143 and solve for n
an = -3n + 7
-143 = -3n + 7
-143-7 = -3n
-150 = -3n
-150/(-3) = n
50 = n
n = 50
So it's the 50th term.
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