Using multiplication when multiplied by 9 will give the answer 2385

Can you me find the missing length. i attached an image.

How to write four times a number, minus 6,is equal to theee times the number+8 as an equqtion

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