Which situation would result in a value of O? Melvin has $50 and pays $35 for two shirts.
O $
Kristina buys a vase for $24 and then returns it for a refund of $24.
O
Alice sells 14 out of 15 candy bars.
Bob exercises 45 minutes on Monday and 45 minutes on Wednesday.

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?