A rectangular prism has a length of 5 cm, a width of 2 1/2cm and a height of 1 1/2 cm Which expressions can be used to find the volume of the prism?

Select each correct answer.

5∙2 1/2∙1 1/2

12 1/2∙1 1/2

1 1/2 (5+2 1/2)

1/2 (12 1/2∙1 1/2)

I don't get it because it is hard

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