
Robiul H. answered 04/24/21
An Adequate Math Tutor
we have three rectangular prisms whose formula is (l x w x h) so lets identify the length, width and height of these prisms.
the prism to the right has a length of 3,WIDTH OF 8, AND A HEIGHT OF 3
so 3 x 8 x 3=72 sq. in for the first rectangular prism and the other rectangualr prism to the left also has the same dimensions because the combined length of this composite is 9 in and the length of the middle and right rectangular prism are both 3in so 9-3-3=3. So we can then multiply 72 x 2=144 since you are adding the same number twice.
The middle rectang. has l=3, w=5 and h=3 so 3 x 5 x 3=45
then add total volumes together 144+45=189 sq. in which is the volume of composite figure.