286.8 is the 24th term in the sequence.
In an arithmetic sequence we need to know
We know neither of them, and as we are looking for two variables, we will make simultaneous equations.
Substitute 12.6 for d in A:
Now we can write the General Term for this sequence..
Which term is 286.8??
Let the number of steps be
Let the 5th term be
Let the difference between terms be
An arithmetic sequence is of form:
The number of steps between the given terms:
So there are 5 steps from
Thus for the target term we have:
So the term is