Tien bought 12 books. two thirds of the books are science fiction. how many of the books are science fiction

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?

Ftara spends $219 a month for her car payment and she makes $3,200 a month, what percent of her monthly income is spent on her car payment?