they need is paid for by taxpayers. >> good morning, everybody. >> reporter: about 90 miles from christina's house in los angeles, lisa begins the first day of algebra class from her home in lake ellsinore, california. >> i am one of the three algebra 2 teachers. >> reporter: christina's other teachers are spread across the state. as for the students, watch the map light up when she asks algebra students to mark where they live with a star. >> we have a lot of southern california student students. >> reporter: christina is one of 200 students in class. she teaches using a combination of her voice, powerpoint-type graphics and this cyber chalk board which students see on her screen. >> you can put quizzes inside of your presentation. >> reporter: students can ask questions through a chat panel the teacher sees on her screen.