In a series of practice problems, learners use the substitution method to solve systems of linear equations, also called "simultaneous linear equations."

Learners follow step-by-step instructions for finding the lowest common denominator for a group of algebraic fractions and then enter their answers to three problems. Immediate feedback is provided. This activity has audio content.

In this learning activity you'll factor problems using the difference of two perfect squares.

In this interactive object, learners study the properties of a trapezoid and use a geometric formula to find its perimeter and area.