A jeweler purchased 5 oz. of gold and 10 oz. of platinum for a total cost of $2375. In a second purchase at the same prices, the jeweler bought 8 oz. of gold and 7 oz. of
platinum for a cost of $2225. What is the cost per ounce of the gold and the platinum?

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?