I will give you all five stars⭐⭐⭐⭐⭐

Answer:
8 because the cd side is double the side of ab side so 4 doubled would be 8
Step-by-step explanation:
Answer:
20b
Step-by-step explanation:
4 times 5=20b
The reason why it is labled 20b is because it is a variable and there is no number.