Identify the Sequence 0 , 5 , 10 , 15 , 20

This is an arithmetic sequence since there is a common difference between each term. In this case, adding ${\displaystyle 5}$ 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 ${\displaystyle a_1=0}$ and ${\displaystyle d=5}$.

Add ${\displaystyle 0}$ and ${\displaystyle 5(n-1)}$.

Apply the distributive property.