Jaxon goes to a store an buys an item that costs xx dollars. He has a coupon for 20% off, and then a 4% tax is added to the discounted price. Write an expression in terms of xx that represents the total amount that Jaxon paid at the register.

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label?