Answer:
A.) 2(20x8)+2(15x20)=920
B.) 120 mm sq
C.) 1160 mm sq
Explanation:
Starting with A.)
okay so basicly what they are asking you to do is find the area of each faces except for the bases. since a rectangular prisim has equal parallel faces, they tell you to multiply the the area of one to find the other parallel face.
Now B.)
it is just telling you to find the area of ONE base so that one is fairly simple.
And lastly C.)
for C, all you are doing is doubling B since we only found the area for one base, and adding A's answer to it to find your total surface area.