I will mark the rectangle as 1 and the triangle as 2.
1. A= bxh
A= (5)x(11)
A=55
2. A= bxh /2
A= (8)x(11) /2
A=44
55+44=99
Therefore, the area of the composite shape is 99.
*Reminder- For the triangle, the reason the base is 8 is because 13-5= 8 (8 is the missing base of the triangle).
I hope this helps and hopefully it’s clear! :)