Use the limit comparison test to say whether or not a series is convergent. The limit comparison test lets you conclude that the behavior of the original series is the same as the behavior of the comparison series.

Use the comparison test to say whether or not a series is convergent. If the comparison series is smaller than the original series and diverges, then by the comparison test the original series also diverges. If the comparison series is larger than the original series and converges, then by the comparison test the original series also converges.

Use the integral test to say whether or not a series is convergent. In order to use the integral test, you have to be able to integrate the series, and the series must be positive, decreasing, and continuous in its domain.

In this video, learn howto find the sum of a telescoping series.

In order to change a repeating decimal into a fraction, you can express the decimal number as an infinite geometric series, then find the sum of the geometric series and simplify the sum into a single fraction.

Find the sum of a geometric series by identifying values of 'a' and 'r'.

How to find the vertex, axis, focus, and directrix of a parabola.

The set of points that is three times as distant from one point as from another will be a circle that's closer to one point than the other.

The set of points equally distant from two points will be the line that is perpendicular to the line that connects the two points.

Given the equation of a circle, we can say whether the equation represents a circle, a single point, or no points at all.