Algebra in Shopping: Exponential with a Starting Value

In this video, there is a discussion of how algebra might be used in real-world situations relating to Shopping. The particular type of equation they discuss here is Exponential with a Starting Value.

TEKS: Math TEK Algebra I.9.B-C; Math TEK Algebra II.5.B
CCSS: CCSS.MATH.CONTENT.HSA.CED.A.2; CCSS.MATH.CONTENT.HSF.BF.A.1.A; CCSS.MATH.CONTENT.HSF.BF.A.1; CCSS.MATH.CONTENT.HSF.IF.C.8.B; CCSS.MATH.CONTENT.HSF.LE.A.1.C; CCSS.MATH.CONTENT.HSF.LE.A.2; CCSS.MATH.CONTENT.HSF.LE.B.5