Hello please help I dont know how to do this

Nine more than four times a number is the same as one less than twice the number. find the number?

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

Which expression is equivalent to 3^3 + 2^2?