the expression needed to solve would be 7(18(20))
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to solve, you can use PEMDAS.
you start to evaluate in the parentheses. in this case that would mean 18*20 and that is 360.
then you multiply 360 by 7 to get 2520.
so your answer is 2,520 and your expression is 7(18(20)) or (18*20)*7. Hope that helps :)
