tell whether this pair of expressions is equivalent or not.
x divded by 5.5 + (-1) +1 and x divided by 5.5
These expressions are equivalent.
Both expressions involve dividing x by 5.5, which gives the same result. The first expression then adds -1 and 1 to the result, resulting in the unchanged quotient of x divided by 5.5. Therefore, the two expressions are equivalent.