Substitute into algebraic expressions and evaluate the result

1. Abominable Algebra - Solve an expression for a given value of x
2. Abominable Algebra - Solve an expression for a given value of x
3. Now You See It! - Substitute given values into algebraic expressions
4. Stop the Clock! Substitute a value into an algebraic expression
5. Abominable Algebra - Solve an expression for a given value of x
6. Abominable Algebra - Solve an expression for a given value of x
7. Abominable Algebra - Solve an expression for a given value of x
8. Polly's Polygons - Substitute a value into an algebraic expression
9. Stop the Clock! Substitute a value into an algebraic expression (1)
10. Stop the Clock! Substitute a value into an algebraic expression (1)