exponential decrease f(x)=ab^x:

https://www.desmos.com/calculator/izvrtjcfgj

exponential increase f(x)=ab^x

https://www.desmos.com/calculator/hrtfdviyag

https://youtu.be/6kaTDzuaxWo

http://www.virtualnerd.com/algebra-1/exponents-exponential-functions/exponential-function/

http://www.virtualnerd.com/algebra-1/exponents-exponential-functions/exponential-function/identify-and-evaluate/exponential-function-word-problem

http://www.virtualnerd.com/algebra-1/exponents-exponential-functions/exponential-function/graphing/graphing-with-tables

http://www.virtualnerd.com/algebra-1/exponents-exponential-functions/exponential-function/identify-and-evaluate/identify-from-data

http://www.virtualnerd.com/algebra-1/exponents-exponential-functions/growth-decay/growth/growth-definition

http://www.virtualnerd.com/algebra-1/exponents-exponential-functions/growth-decay/decay/What-is-exponential-decay

http://www.virtualnerd.com/algebra-1/exponents-exponential-functions/growth-decay/growth/growth-word-problem