In Penn stacks all of his snowballs in a sequence pyramid the number of snowballs P(n) in n layers of the square pyramid is given by

1/8 is left? add a bit more info plz

answer: hence, function will be

explanation:

since we have given that

cost of a new textbook = $85

according to question, the resale value of a textbook decreases by 25% with each previous owner,

so, our function becomes,

here, y is the total value of the text book after x owners.

hence, function will be