❗️❗️❗️Find the length of side x in simplest radical form with a rational denominator.❗️❗️❗️ Pls help me

Need this asap if anyone can i would be very grateful. if you could show workings that would really

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?