20. Use the properties of integers to calculate the value of the following
(a) 25 (-17) + (-17) x 75
(b) (-18) (-4) + (-96) (-18)
(c) 29* 72+(-72) 19
(d) (89) 99
(e) (-35) (-49) + 35
(0) (-31) (-13)
(g) 999 x 81 +81
(h) 256 X 16+ (-6) 256
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