*HELP ME WITH THIS PROBLEM ASAP I COULD FAIL*

If the measure of xyz is 81 what is the measure of yz

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Answer this two poles, ab and ed, are fixed to the ground with the of ropes ac and ec, as shown: two right triangles abc and edc have a common vertex c. angle abc and edc are right angles. ab is labeled 13 feet, ac is labeled 15 feet, ec is labeled 10 feet, and ed is labeled 4 feet.what is the approximate distance, in feet, between the two poles? 11.14 feet16.65 feet14.35 feet15.59 feet