The arrowheads are not showing up on the powerpoints fairly consistently.  The line shows, but not the arrow head.

Brenda - we have corrected the arrowhead issue. Please download the presentation again. - Melissa

Slide 88 has an incorrect answer... the video shows the correct answer D, but the slide shows B.

Thank you for altering us to these issues. We are working on getting them corrected and will have a new version posted shortly.