Please briefly explain

Which equation matches the graph shown ?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

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