6+11+16+21 n=11 arithmetic sequences

Me with this one question, and i'll upvote the brainliest answer

Find the slope of the line passing through a pair of points

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?