What is the gcf of the numerator and denominator in the following fraction? 21 m to the 2nd power n/28 mn to the 2nd power

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

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?

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41