Jessica has a set of 12 good friends. When planning her wedding, she must choose 3 bridesmaids of her 12 friends. How many subsets of size 3 are there?
a.36
b.1320
c.1728
d.220

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