An expression is shown below: the square root of 18 plus the square root of 2 Which statement is true about the expression? It is rational and equal to 4 times the square root of 2. It is irrational and equal to 4 times the square root of 2. It is rational and equal to 3 times the square root of 2. It is irrational and equal to 3 times the square root of 2.