Please help i give brainliest and points

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?