A "passing grade" is a grade that is good enough to get a student through a class or semester.
Get Help with your Homework
If you're struggling with your homework, don't hesitate to ask for help. There are plenty of resources available to you, including your teacher, classmates, and online tutoring services.
Clarify mathematic equation
Mathematical equations can often be confusing, but there are ways to make them clearer. By using simple language and breaking the equation down into smaller pieces, you can help your reader understand what the equation is trying to say.