Question 762542
What is the general term?  First term is -6 and common difference is +3.

Any term a is {{{a=(-6)+(3)*(n-1)}}}
{{{a=-6+3(n-1).}}}


If a=222, then you find the value of n by equating the formula with the value of a.


{{{highlight(-6+3(n-1)=222)}}}
Solve for n.