Applications are considered as a whole package, so there are no limits on GPA or GRE scores.  A weakness in one part of your application can be balanced by a strength in another part of your application.

Recommendation letters should address your work ethic,  your academic ability,  and your determination to succeed. Choose letter-writers that will address these issues.  At least one letter should address your quantitative (math) abilities.

We may not be familiar with the people writing you letters, so use your personal statement to inform us of the background of the people who write you letters.