Donald graphs the distance he walks over time. The graph passes through the points (3,12) and (4,16). Answer parts a and b. HELP PLEASE I NEED BOTH PARTS A AND B

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