David recieved $50 for working at his dads store. he spent $20 at the movies, and $10 buying a comic books. after buying $5 worth of candy, he saved the rest. what was the ratio of the amount of david spent to the amount that david saved?

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

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?

Klmn and pqrs are similar trapezoids. which side of pqrs corresponds to lm