Find the solution of each equation using the given replacement set please help ASAP

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

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.

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20