Find the 10th term of the AP 13, 8, 3, -2,.......?

In the given AP,
we have a = 13 , d = (8 - 13) = -5 and n = 10
T_n = a + (n - 1)d
T₁₀ = 13 + (10 - 1) - 5
= 13 + 9 x (-5) = 13 - 45 = -32