8x-5=19
+5 on each side
8x=24
Divide by 8 on each side.
X=3
you can just split the figure in 2 separate figures and them add the areas:
area rec. 1:
3m×3m= 9m²
area rec. 2:
3m× (2m+3m)
= 3m×5m
=15m²
total area:
9m²+15m²= 24m²
I believe that the answer to your question in b = 0.