Answer
A(n)=A(1-n)-11 ; A(1)=99
Work Step by Step
The formula for a recursive equation is A(n)=A(1-n)+c (c is the common difference)
We can find c by subtracting the first and second terms from each other.
c=88-99
c=-11
This gives us the equation A(n)=A(n-1)-11 ; A(1)=99
And since we know the first term in the sequence, we have to list in next to the formula.
