Answer:
4.3 cm
Step-by-step explanation:
length - width: 11.9 - 7.6 = 4.3
Since you know that the pet store has 9 dog leashed, and we know that they have 8 fewer dog leashes than dog collars we can just add 8 to 9 to get 17 dog collars
18
Equation
2x=36
Solve
x=18
the two triangles are congruent