P please please pa help

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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?

Divide. –4.2 ÷ 6 = a –0.7 b 0.7 c –7 d 7 me

Measure a and b and find their sum. how are the angles related?