Which expression is equivalent

The sum of two numbers is 12 and their difference is 18 what are the two numbers

How does a low unemployment rate affect a nation's economy? a. the nation has a higher number of productive resources. b. the nation can spend more money on for unemployed people. c. the nation can save money by paying lower salaries to a large workforce. reset

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?