PLS HELP ASAP THANKS ILL GIVE BRAINLKEST (last answer is 8)

Answer:
question 8 = 6cm
Step-by-step explanation:
[tex]formula (perimeter)= \\ sum \: of \: all \: sides \\ \\ 3x + 3x + x + x = 48 \\ 3(6) + 3(6) + 6 + 6 = 48 \\ 18 + 18 + 6 + 6 = 48[/tex]