This set of cards can be used to review the various concepts related to finding and using a tangent line. This would be a great activity for students in calculus and AP Calculus. Each card has a problem written in black and an answer to another problem (in the magnifying glass). By using the 10 cards that have a heart at the bottom or you use the 10 cards with a club you will have 10 cards scavenger hunt. If you use the 20 cards with a diamond you will have a combined scavenger hunt with 20 cards.