Answer:
Step-by-step explanation:
11.
Area as sum: 
Area as Product: 7(d+4)
12. Area as sum: y*y+y*3
Area as Product: y(y+3)
55+p=105
subtract 55 from both sides
p=50
MAGIC
Answer:
triangle 1, triangle 3,
Step-by-step explanation:
Triangle 1= 
Triangle 2= is wrong
Triangle 3= 
Triangle 4= is wrong.