Answer:
You just made a silly mistake. Angle A is 79, not 89. Just be more careful next time. (Remember, this figure is a cyclic quadrilateral whos opposite angles add up to 180)
Answer:

Step-by-step explanation:

All of the above options are true, so the answer is choice D.
If by description you mean simplification then: 84x/28
Answer: $2203.74
Step-by-step explanation: