**Answer:** Rational numbers are numbers that can be expressed as a fraction $rac{p}{q}$ where $p$ and $q$ are integers and $q 
eq 0$. The sum of two rational numbers is always a rational number. Thus, $x+1 = rac{3}{4} + 1 = rac{7}{4}$, which is rational. $qrt{2}$, $i$, and $e$ are irrational numbers.