Which of the following sets represents a function?
a. {(3, 5), (-1, 7), (3, 9)}
b. {(1, 2), (3, 2), (5, 7)}
c. {(1, 2), (1, 4), (1, 6)}

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