¿Cómo se hace una suma de expresiones racionales?​

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- 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. 3- 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 part b?