I need help PLEASE . Number four, what’s the answer and please explain

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

15 there is a line that includes the point 0,10 and has a slope of 7/4. what is it’s equation in slope intercept form

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.