In boot camp, a cadet must use a rope swing to cross an obstacle without
falling into the water hazard below. unfortunately, they miss the platform on
the other side and swing back to where they started. if it takes the cadet 4.5
seconds to swing from one side of the obstacle to the other and back, how
long is the rope swing? use the formula:
t=2pie ,square root l over 9.8

Me because some of question i don’t understand

If you have the following equation, 2/3x+5/6-x=2-3/4x what would you multiply each term by to get rid of all the fractions

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?