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B
20xy+5x2yz
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C
20x2y+5xyz
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D
20xy+5x2z
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Solution
The correct option is A20x2y+5x2yz We use distributive law to multiply a monomial and a binomial, as shown below: (5x)(4xy+xyz) =(5x×4xy)+(5x×xyz) =20x2y+5x2yz