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7.(y.3) use one or more properties to rewrite without parentheses

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1 Answer

if you're trying to rewrite 7*(y*3), then you just multiply 7 by 3y and you would get 21y

7*(y*3) = 7*(3*y) = (7*3)*y = 21y


and for the other example question

(a+5)+23 = a+(5+23) = a+28

so, could it be the number first, then the variable? or just the variable then the number, or does it not matter?