Answer:
12x-6
Step-by-step explanation:
perimeter= 2l+2w
=2(x+4)+2(5x-7)
=2x+8+10x-14
=12x-6
x=k/y
w=k/t
5=k/√49
5=k/7
k=5×7
k=35
3
Each of the lines lengths multiply by 3.