I need help the Arithmetic Sequence problem

3a.

a_n = a₁ + (n - 1) d.

a₈ = -4 + 7(3) = 17

Therefore the 8^th term of the sequence is 17.

3b.

\(a_{n+1} = a_n + 3\)

Because the next term is always greater than the last term by 3.

\(\text{Explicit formula: } a_n = 3n - 7\).

If we plot the graph of \(a_n\) against \(n\) of this explicit formula, we get a straight line with slope = 3 and y-intercept = -7. If we plug in 1,2,3,..., we get the corresponding term of the sequence.