:( which one is it??

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-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