exam Maths Puzzle Numerical Ability

72. A study by Dr. Aaron R. Folsom concluded that waist to hip ratios are a better predictor of 5 year survival than more traditional height to weight ratios. Dr. Folsom concluded

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ok for the top of question 23 in chap 7 on pg 494 i left the 6x2 as is. for the bottom part i foiled it out. orignal: x2+2x-35 so i (x+7)(x-5)then there is the division sign then f The base of a 50 foot ladder is 14 feet from a vertical wall. The ladder slides down so the base is now 30 feet from the wall. How far did the top of the ladder move down the wall?