Question

Jessica owns a bookstore. The day after a new book by a popular author was placed on the shelves, Jessica’s store sold 166 copies of the book. Each day after the book’s release, the number of sales decreased by 17%. What function represents the book sales t days after the release?

Answer 1

Explanation:

For this case we have a function of the form:

y = A * (b) ^ t

Where,

A: initial quantity of copies sold

b: decrease rate

t: time in days

Substituting values we have:

y = 166 * (0.83) ^ t

Answer 2

For this case we have a function of the form:

`image`

Where,

A: initial quantity of copies sold

b: decrease rate

t: time in days

Substituting values we have:

`image`

Answer:

A function that represents the book sales days after the release is:

`y = 166 * (0.83) ^ t`