Can anyone work me through this and explain how to do this? i'm kinda confused. subject is: "simplify numerical radical expressions involving square roots"
i don't just want the answers, i want understanding how to do this.

Abe is a triangle. can you use the sss postulate or the sas postulate to prove triangle abc = triangle aed? by sss only neither apply both apply by sas only

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

Ineed to know the answer right now! !