What are two decimals that are equivalent to 7.7

Im literally having a mental breakdown

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

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?