The top two answers are equivalent, while the bottom one is not. You would use distributive property in the parentheses. If both expressions are the same, they are equivalent
Since the two triangles are similar

Also,

Answer:
d. overal size
Step-by-step explanation:
It is 18.02. First you multiply 5.4 by 6.8 because it is a triangle you have to divide it by 2. 5.4x6.8=36.04 36.04/2=18.02
3b+2-b=-18
2b+2=-18
2b=-20
b=-10