Thirty minutes after a father left for work on the bus, he noticed that he had left his briefcase at home. His son left home, driving at 65 mph, to catch the bus that was traveling at 40 mph.

How long did it take the son to catch the bus?

The son took [?] hr to catch the bus.

(Answer is either an integer or a simplified fraction)

What is the y intercept of f(x)=(1/2)^x?

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

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?