NO LINKS OR ELSE YOU'LL BE REPORTED! Only answer if you're very good at Math. Let u= (5,-12) and c= -3.What is ||cu||?

A: 21

B: 51

C: 39

D: -39​

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?