13 times an unknown number added to 72 equals -23 times the unknown number. what is the solution to the sentence ?

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

In the diagram of circle o, what is the measure of zabc?

What is perpendicular to y=-1/2x+11