Question

pls answers all questions

Answer 1

(1) 216^  1/3 = ∛216 = 6
(2) 3
(4) -5
(5) 1/(3 - √5) = (3 + √5)/(3² - √5²) = (3 + √5) / 4
(6)2x² - 7x + 3
    2x² - x - 6x + 3
    x(2x -1) -3(2x-1)
    (x-3)(2x-1) 
(7) AB = CD
     AB + BC = CD + BC
     AC = BD
     hence proved
( 8 ) 97 * 103 = (100 - 3) ( 100 + 3) = (100² - 3²) = (10000 - 9) = 9991
(9) let 0.63 = x
     therefore, 100x = 63.63
     100x -x = 63.63 - 0.63
     99x = 63
     x = 63 / 99
     x = 7 / 11
(10) question not visible
(11) 2/3 = 8 /12 = 80 / 120
        3 /4 = 9 /12 = 90 / 120
        therefore numbers are 83/120, 81/120, 85/120 and 87/120
(12) the whole is greater than a part
       when equals are added to equals, the resultants are equal
       when equals are subtracted from equals, the resultants are equal