We find the area of all the faces and add those up
So
Total area = (12*5) + 2(1/2 *3 *4 ) + (4*12)+(3*12)
= 60 + 12 + 48 + 36
= 156 square feet
third option is the correct one
Answer:
The answer is option B, x = 4.2
The GCF of those numbers is 2
14+36+h=400
50+h=400
-50 -50
---------------------
h=350mm