Please help this is for a timed test!!!

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

Pranza plotted point a in the coordinate plane below.

The area of a circle is equal to 1 dm². find the radius of the circle.