On monday joe bought 10 cups of coffee and 5 doughnuts for his his office at the cost of $16.50. it turns out that the doughnuts were more popular than the office. on tuesday he bough 5 cups of coffee and 10 doughnuts for a total of 14.25. how much was each cup of coffee

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?