The answer key for each practice sheet is on the last page of each practice sheet.
Exponential Functions: Introduction and Graphing
Video: https://youtu.be/8DcEqLLyk-s
Practice: http://www.jmap.org/Worksheets/F.IF.C.7.GraphingExponentialFunctions1.pdf
Exponential Growth and Decay and Modeling
Video: https://youtu.be/A66H59Ra2co
Practice: http://www.jmap.org/Worksheets/F.BF.A.1.ModelingExponentialFunctions1a.pdf
Linear versus Exponential Functions
Video: https://youtu.be/DRDPEXNP_1s
Practice: http://www.jmap.org/Worksheets/F.LE.A.1.FamiliesofFunctions1.pdf