Fill in the table.
input values = 1, 3, 5
rule: add 2
input
output

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72