SOLUTION: A closed box is 7dm by 4dm by 5dm. What is its total surface area? And its volume?

Algebra ->  Surface-area -> SOLUTION: A closed box is 7dm by 4dm by 5dm. What is its total surface area? And its volume?      Log On


   

Question 828922: A closed box is 7dm by 4dm by 5dm. What is its total surface area? And its volume?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The box is 7 x 4 x 5
Think of it as a 7 x 4 rectangle
laying flat on a table. with a
height of 5.
-----------------
There are (2) 7 x 4 surfaces
There are (2) 7 x 5 surfaces
There are (2) 4 x 5 surfaces
That is +3%2A2+=+6+ surfaces total
+2%2A%28+7%2A4+%2B+7%2A5+%2B+4%2A5+%29+=+2%2A%28+28+%2B+35+%2B+20+%29+
+2%2A83+=+166+ square units
----------------------------------
The volume is +7%2A4%2A5+=+140+ cubic units