# Simplifying Powers of i (Method of Dividing by 4)

This video explains how to simplify powers of i, the imaginary unit.

# Estimate Cost of Patio Based Upon Area (When to Round?)

This video solves an application problem using rates. Using exact rates to perform calculations is emphasized.

# Use Rates to Find Driving Miles and Gallons Need for Distance (When to Round?)

This video solves an application problem using rates. Using exact rates to perform calculations is emphasized.

# Unit Rates: Dollars Per Quart and Quarts Per Dollar

This video explains to find two unit rates from 1 rate.

# Solve a Trig Equation Using Reciprocal Identities: 2cos^2(x)-cot(x)=0

This video explains how to solve a trig equation using reciprocal identities.

# Solve a Trig Equation Using Reciprocal Identities: tan^2(x)=4sin^2(x)

This video explains how to solve a trig equation using reciprocal identities.

# Solve a Trig Equation Using Reciprocal Identities: 2cot(x)+csc(x)=0

This video explains how to solve a trig equation using reciprocal identities.