Eddie has $45. He needs a new bike tire that costs $70. Write and then evaluate a subtraction expression to determine how much more Eddie needs in order to get the bike tire.

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?