A) Given:
The sequence is,
[tex]1,2,3,4,5,6,7,8,…[/tex]To find: The term-to-term rule
Since the given sequence has the common differnce 1.
So, it is of the arithmetic sequence.
Therefore, let us take
[tex]a_1=1[/tex]Then the second term will be,
[tex]\begin{gathered} a_2=a_1+1 \\ =1+1 \\ =2 \end{gathered}[/tex]The third term will be,
[tex]\begin{gathered} a_3=a_2+1 \\ =2+1 \\ =3 \end{gathered}[/tex]And so on.
So, the term to term rule must be,
[tex]a_n=a_{n-1}+1[/tex]Final answer: The term to term rule is,
[tex]a_{n}=a_{n-1}+1[/tex]