Celeste bought a graphing calculator for $31.14. it was 25% off original price? what was the original price?

Which of these choices show a pair of equivalent expressions?

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

Sum is 17 and their difference is 3