A.
well, to find the perimeter of a rectangle, it is 2(length+width)
using this, the perimeter of the tennis court is 2(2x+6+x)=2(3x+6)=6x+12
the perimeter of the basketball court is 2(3x-14+1/2x+32)=2(2 1/2x+18)= 5x+36
B.
the difference is subtraction, so it'd be 6x-12-(5x+36)
C.
width is 2x+6
2x+6=36
2x=30
x=15
tennis: 15 by 36
basketball: 3*15-14= 31
1/2*15+32= 39.5
31 by 39.5