Answer:

Step-by-step explanation:
<u>Step 1: Determine the area of the bottom rectangle</u>



<u>Step 2: Determine the area of the back rectangle</u>



<u>Step 3: Determine the area of the top rectangle</u>



<u>Step 4: Determine the area of the triangle</u>




<u>Step 5: Determine the surface area</u>


Answer: 
Answer:
54
Step-by-step explanation:
90 +36 = 126
There is 180 degrees in a triangle.
180 - 126 = 54
Step-by-step explanation:
(5√2-4√3)(5√2-4√3)=
(5√2-4√3)^2=(5√2)^2+(4√3)^2-2(5√2)(4√3)
=25*2+16*3-10√2*4√3
=50+48-10√2*4√3
=98-10√2*4√3 is the answer