If i have a problem that says, sofia has $1,000 in her bank account. she pays $75 to a credit card company each month. she doesn't want her account to go below $450. how would i solve that as an equality?

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?