Notice that the table skips many of the terms. An equation of the form $t(n) = mn + t(0)$) needs to be written.

Think of the sequence as a function with the points $\left(1, 1\right)$ and $\left(5, −7\right)$. Use these points to find m.

Use m to calculate $t\left(0\right)$.

Write your equation.

Let $n = 23$ in your equation to find $t\left(23\right)$.

Is this sequence arithmetic or geometric?
Use the pattern in the table to find the 4th term.