Mr. Walker asked his students to use the associative property to find an expression that is equivalent to (13+15+20) + (20+47+18). The expressions that four students created are shown in the table below.
Jerry (20+13+15) + (20+47+18)
Layla (20+47+18) + (13+15+20)
Keith (13+20) + (20+47+18) + 15
Melinda (13+15+20+20) + (47+18)
How many of the students correctly applied only the associative property to rewrite the expression?
one
two
three
four
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