Can someone help please ASAP

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?

When is g(x) = 0 for the function g(x) = 5.23x + 4?

Someone me! will award brainliest if u explain and answer!