What is PT-141?

How do you get the number 12 only using 1234? What is an accurate way of measuring angles? How many gallons of water are needed to fill a 20 foot long by 10 foot wide free form pool 3 x 10 feet on the shallow end and 6 x 10 feet on the deep end? Why is the tangent of 45 equals 1? How do you write eleven lakhs ten thousand in numeric? Show pictures of letters having line of symmetry? What is the prime factorizatio for 450? Is the word target a compound word? Is 18624 closer to 19000 or 18000? What is 72 plus 18? What is the value of 5 in 1452? What is DCCLXXXIX in roman numrals? One roll of carpet covers 900 square feet How many rolls of carpet would be needed for a room that is 40 ft x 60 ft? How many is 160 percent of 400? What does number 54 mean in the bible? How many hours are in 3.7 billion seconds? How much is 45 times 30? How many gallons of water is in a 12' by 3' pool? What are three reasons of a composite numbers? How do you find a missing weight of a fish using a mean of seven other fish please answer asap?