Final answer:
The value of mZ8 cannot be determined with the given information as there are no additional equations or context to solve for the variable x.
Step-by-step explanation:
If m 23=(6x+11) and mZ8=(3x+16), we're being asked to find mZ8. This seems to be a problem involving algebraic expressions and possibly the use of angles if m refers to measure. Since the question does not provide additional equations or relationships between m 23 and mZ8, we cannot solve for x with the given information. Therefore, the exact numerical value for mZ8 cannot be determined without additional context or equations.