What is the correct equation of the lie shown below?

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

What is the range of the data below? .8090100

Aheated piece of metal cools according to the function c(x) = (.5)x ? 7, where x is measured in hours. a device is added that aids in cooling according to the function h(x) = ? x ? 2. what will be the temperature of the metal after two hours?