What is the place where the initial side and terminal side of an angle meet called?

Ineed solving this problem h/8=-25 solve for h idk how to this can someone show me and also give an answer you

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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