Step-by-step explanation:
Since Angle DAE = Angle BCE, lines AD amd BC are parallel (by Z-angles).
This means that Angle ADE = Angle CBE (by Z-angles).
We have 2 congruent angles and 1 congruent side (AD = BC, given).
By ASA congruence, triangles AED and CEB are congruent.
For this case we have the following functions:

By definition of composition of functions we have:

Then substituting:

So:

Answer:

50 dollars is the final price
Answer:
-60/7 or -8 4/7 would be the answer