Selena is standing on a rock cliff that is 52 feet high. she tosses a pebble upward over the edge, where it hits the top of a 12 foot high boulder. the quadratic equation that models the path of the pebble is given below. how long did it take for the pebble to hit the top of the boulder? p(t)=-16t^2+12t+52

5/6+7/8what is the answer sealsdbdbshd

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?

Ineed to know the answer to this algebra question.