Ameteorologist was accurate 90% of the time, reporting accurately on 45 days. how many days of weather did he report? 50

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?

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have