Book Maths Puzzle Algebra

coplete the square of x2-4x=5

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The U.S Open meet record for the woman's 400-meter freestyle is 4:05.45, set by USA swimmer Janet Evens back in 1987, How much faster was Evans's time then Yamada's? In the 400-meter freestyle, Japan's Sachiko Yamada finished first with a time of 4:12.69 By how much time did Yamanda defeat Bennet