1.) 8x+3 meters

2.) 6x+6 meters

3.) 14x meters

4.) 18x+6 meters

step by step explanation:

1.) 2x+3+6x = 8x+3

2.) (x+2x+3)×2

ㅤ=(3x+3)×2

ㅤ=6x+6

3.) (x+6x)×2

ㅤ=7x×2

ㅤ=14x

4.) (x+2x+3+6x)×2

ㅤ=(9x+3)×2

ㅤ=18x+6