Question 841148
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 <font color="red">50th term</font>.