Find the 4th Term 13 , 19 , 25

This is an arithmetic sequence since there is a common difference between each term. In this case, adding ${\displaystyle 6}$ to the previous term in the sequence gives the next term. In other words, ${\displaystyle a_n=a_1+d(n-1)}$.

This is the formula of an arithmetic sequence.

Substitute in the values of ${\displaystyle a_1=13}$ and ${\displaystyle d=6}$.

Subtract ${\displaystyle 6}$ from ${\displaystyle 13}$.

Substitute in the value of ${\displaystyle n}$ to find the ${\displaystyle n}$th term.

Multiply ${\displaystyle 6}$ by ${\displaystyle 4}$.