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Pls! does anybody know a shortcut for answering these types of questions in the future?

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?

Show all work to identify the discontinuity and zero of the function f of x equals 6 x over quantity x squared minus 36