# Determine an Addition Problem Modeled on a Number Line

This video explains how to write an addition equation from a number line model.

# Add Whole Numbers using Number Lines

This video explains how to add whole numbers using a number line.

# Write a Linear Equation in One Variable App: Increase in Value

This video explains how to write an equation to solving an application problem.

# Determine the Gradient of a Function of Three Variables – Exponential

This video explains how to determine the gradient vector field of a function of three variables.

# Determine the Gradient of a Function of Three Variables – Polynomial

This video explains how to determine the gradient vector field of a function of three variables.

# Show the Gradient to a Surface Using 3D Calc Plotter

This video using 3D Calc Plotter to illustrate the meaning of a gradient vector.

# Show Tangent Lines to a Surface Using 3D Calc Plotter – Directional Derivative

This video using 3D Calc Plotter to illustrate the meaning of a directional derivative.