7th grade math help me plzzz

What is the greatest common factor of 6a, 8a^{2}, and 14?

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

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