This is your answer and for the multiplication I gave it to you step by step
The volume of a prism of this type is
v= (1/2) x B x h x H
(1/2) x 15.24 x 8 x 12
= 732
To convert 2.4 into a radical you have to write the equation;
2.4=√x; then you square both sides, to get x by itself, resulting in 5.8; and then you have to write; "2.4 in radical form is the square root of 5.8