Evaluate the expressions when \( x=3 \) and \( y=4 \). Simplify your answer completely. \( 7 x^{3}+y \) \( 7 y+x^{3} \)

First, let's evaluate the expression \( 7x^{3} + y \) when \( x = 3 \) and \( y = 4 \): \[ 7(3^{3}) + 4 = 7(27) + 4 = 189 + 4 = 193 \] Now, let's evaluate the expression \( 7y + x^{3} \): \[ 7(4) + (3^{3}) = 28 + 27 = 55 \] So, the simplified results are \( 193 \) and \( 55 \) for the two expressions, respectively.