Question

Expression and Perimeter and how you did it, please?

Answer 1

19) 20)
The expression would be: 
3x+4x+5x
If x=8, the perimeter would be:
3(8)+4(8)+5(8)
24+32+40
=96 feet

21) 22)
The expression would be:
x+14+5+7+5.5+2x
If x=10.5, the perimeter would be:
10.5+14+5+7+5.5+2(10.5)
10.5+14+5+7+5.5+21
=63 feet 

Hope this helps.
-Benjamin