find the volume of this prism.

The volume of the prism as given with dimensions is; 840cm³.
The prism given in the task content can be further subdivided to be represented by two rectangular prisms as follows;
First prism = 10cm by 6cm by 8cm.
Second prism = 5cm by 12cm by 6cm
Hence, the volume of the prism is; (10×6×8) + (5×12×6) = 840cm³.
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