Let's visualize the information we have been given. We notice that the numbers are getting lower, so the common difference has to be a negative number.
The of the arithmetic sequence can be determined by subtracting one of the terms from the next. Let's subtract the first term from the second term.
Knowing the common difference, we should subtract
enough times until we end up at
If we call this number of times
, we get the following equation.
Let's solve for
The eight term is