1.1. The Number Line 
 1.2. Absolute Value 
 1.4. Integers 
 1.5. Exponents and Roots 
 1.6. Logarithms 
 1.7. PEMDAS 
 1.8.1. Working with Fractions 
 1.8.2. Operations with Fractions 
 1.8.4. Complex Fractions 
 1.8.5. Working with Percents 
 2. Algebra 
 5. Trigonometry 
 6. Functions 
 Global
 Global