The intersection of the two sets is the list of members that appear in both sets. That is {3}.
Your statement is FALSE.
You convert 432 sq inches into inches so 20.7846. Then you times that by 6. The answer is 124.7076 and if rounded 124.7
3x+11=65
3x=54
x=18
180-(35+65)=y
180-100=y
80=y