8/9 - 2/3 what is the answer i need help

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

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.

Find the center of the circle that can be circumscribed about efg with e(4,4) f(4,2) g(8,2)