Final answer:
Expression D is not equivalent to 5x + 6.
Step-by-step explanation:
To determine which expression is not equivalent to 5x + 6, we can simplify each expression and compare them to 5x + 6. Let's simplify each expression:
A) 4x + 7 + x - 1 simplifies to 5x + 6, so this expression is equivalent.
B) 3x + 3 + 2x + 3 simplifies to 5x + 6, so this expression is equivalent.
C) 5(x + 1) + 1 simplifies to 5x + 6, so this expression is equivalent.
D) x(5 + 6) simplifies to 11x, which is not equivalent to 5x + 6.
Therefore, expression D is not equivalent to 5x + 6.