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Verified Answer :

All you are doing is multiplying the sides together:

752

=70

70 is the volume of the sandbox

We'll to find the volume of a Rectangular Prism, first you have to know this:
\(V=whl\), so that means 
\(V=(7)*(5)*(2)\), and \(7*5=35\), so 
\(35*2=70\)
Final Answer: \(V=70ft.\)