Answer:
15m+80 would be the correct equation
I have solved the answer in the pic below, hope it helpss!!!!
I think you mean,

You can use the usual formula,

That in this case is,

Where I have used,
Answer:
D Not enough information
Step-by-step explanation:
They give us one pair of congruent sides and we know there is a pair of congruent angles because of vertical angles however we can't say for sure that the sides are equal because there is no theorem to prove it and we can't guess by eye in Geometry
Hope This Helps :)