Which is the equation of a hyperbola with directrices at x = ±3 and foci at (4, 0) and (−4, 0)? x squared over 16 minus y squared over 4 equals 1 x squared over 12 minus y squared over 4 equals 1 y squared over 16 minus x squared over 4 equals 1 y squared over 12 minus x squared over 4 equals 1

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?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

What is the value of x in the equation 1.5x+4-3=4.5(x-2)?