PLEASE HELP
Mr.walker asked his students to use the associative property to find an exoression that is equivalent to (13+15+20)+(20+47+18).

Jeremy | (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)