Okay, let’s tackle this. So Terry has a long-term tenure at Core Consulting, which suggests a stable income. He also has experience as an adjunct instructor and public school administrator, which indicates a strong educational background. However, his current role as a mathematics educational consultant is less common, so I'll need to look at industry benchmarks for educational consultants.

According to the Bureau of Labor Statistics, the median annual salary for postsecondary teachers, which includes adjunct instructors, is around $80,000. However, this doesn't account for the additional income from consulting work. Educational consultants can charge higher rates, but it's harder to determine a specific range without more information.

Considering Terry's experience, education, and location, I'll estimate his hourly rate to be around $120. This is slightly below the median salary for postsecondary teachers, but higher than what I'd expect for a non-tenured adjunct instructor. It's also lower than what I'd expect for a more senior consultant with a stronger track record of success.

Let’s check averages for educational consultants in the Atlanta area. According to Indeed, the average hourly rate for educational consultants in Atlanta is around $150. However, this includes a range of roles and experience levels. Considering Terry's experience and education, I'll stick with my initial estimate of $120 per hour.