Is this correct?? If not please correct me if you can. I highlighted my answers and added arrows to show my answers.

The price of a coat increased from $78 to $92. what is the price increase percentage?

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

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