3. Calculate and verify using the a...
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3. Calculate and verify using the associative law: a) 15 x [(-3)*(-4)] b) [{-4) x(-6)] x'(-12)

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associatiue ( (a omega=(a times(b times c)]=[(a times b) times text { Pail })=(4 a times c+4 times b) ) sol 3 a) ( left[begin{array}{ll}5 & x & {[(-3) times(-4)}end{array}right]=left[begin{array}{l}5 times[12] 60end{array}right] ) also ( [[5 times(-3)] times(-4)]=[(-15) times(-4)] ) 60 (hence prove 2) Mimelarly do for
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