Which difference is about 10? A. 33 . 2 − 28 . 4 B. 70 . 9 − 58 . 7 C. 42 . 5 − 16 . 8 D. 65 . 7 − 65 . 6

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

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?

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?