What kind of number is 11 squared

Somone me i want to know what 18 hours out of 24 hours in a fraction

If i have one apple and give you the apple, how many apples do i have?

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