## Reflection: Connection to Prior Knowledge Credit Card Investigation: What is interest? (Day 2 of 4) - Section 2: Day 2 Credit Card Investigation

My students were unsure of their answers for question 2 of the applying knowledge section. Many students were asking me questions and wanting me to check their answers. So I saw this as a good time to have a whole class discussion about one strategy they could use to check their own answers… making a table to represent the situation and then check their equation based on this table (as they did in the Sorting out the Change lesson): Credit Card Investigation, reflection, Apply Knowledge Question 2.

Video Oops: At the start of the video I said “Day 1” of investigation… it’s now “Day 2.” And at the end I said “growth rate” I meant “decay rate.”

Connection to Prior Knowledge: Great Discussion Opportunity (Part 4: Applying Knowledge Question 2)

# Credit Card Investigation: What is interest? (Day 2 of 4)

Unit 4: Exponential Functions and Equations
Lesson 10 of 14

## Big Idea: On day 2 students find percent increase/decrease and simple interest to establish a pattern which extends to writing exponential functions.

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Standards:
Subject(s):
Math, Precalculus and Calculus, percent change, PreCalculus, exponential function, writing exponential equations, exponenital growth, function
50 minutes

### Tiffany Dawdy

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