For brainliest!! I need a quick step by step explanation on how to do this

If chord ab is congruent to chord cd, then what must be true about ef and eg?

Ineed with this problem 21 show steps

Consider this expression and the steps to evaluate it. 4^5(−2)^9/4^8(−2)^3 1. apply the quotient of powers:      (−2)^a/4^b 2. evaluate powers:           c/d select the value of each variable. a = _ b = _ c = _ d = _