Which is the recursive formula for this arithmetic sequence? an = an – 1 + 7 where a1 = –10
an = an – 1 + 17 where a1 = –10
an = 7an – 1 - 17 where a1 = –10
an = an – 1 – 7 where a1 = –10

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