a rectangular swimming pool is 20 feet by 22 feet . a deck that has uniform width surrounds the pool . the total area of the pool and deck is 728 square feet . what is the width of the deck ?
let the width = w total area of the pool and deck = ( 2 w + 20 ) ( 2 w + 22 ) we can test the answer choices along with unit digit method a ) 2 feet . . . . . . . . . . . 24 * 26 has unit digit 8 . . . . . . . . . . eliminate b ) 2.5 feet . . . . . . . . . 25 * 33 has unit digit 5 . . . . . . . . . . eliminate c ) 3 feet . . . . . . . . . . . . 26 * 28 has unit digit 4 . . . . . . . . . . . hold d ) 4 feet . . . . . . . . . . . . 28 * 30 has unit digit 0 . . . . . . . . . . . eliminate e ) 5 feet . . . . . . . . . . . . 30 * 32 has unit digit 0 . . . . . . . . . . . eliminate answer : c w = 3
divide(subtract(sqrt(add(power(subtract(22, const_1), const_2), subtract(728, rectangle_area(20, 22)))), subtract(22, const_1)), const_2)