Given the sequence 3,1,-1,-3,... use the arithmetic sequence formula to write an equation.a30

Answer 1

The sequence is arithmetic with common difference d = -2.

nth term = a_n = a₁ + (n - 1)d = 3 - 2(n - 1) = -2n + 5

So, a₃₀ = -2(30) + 5 = -55

Answer 2

X-2..........................