Staples is advertising a Bac-'to-School sale on pencils. A pack of 30 sells for $7.98, whereas a 12-pack of the same brand cost for $4.80. Which is the better buy? Explain.

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?