A model rocket is launched with an initial upward velocity of 175 ft/s. The rockets height h (in feet) after t seconds is given by the following

H=175t-16t^2

Find all values of t for which the rockets height is 85 feet.

Round your answer (s) to the nearest hundredth. (If there is more than one answer, use the “or” button.)

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?