1. explain how you would subtract a − b given two real numbers. be sure to include the following in your explanation: (a) explain how to use a number line to calculate the solution. be sure to explain the process for all possible values of a and b (positive or negative). (b) explain how you can determine whether the result for a − b will be positive or negative. 2. adriana has three kids whose ages are consecutive even integers. the sum of their ages is 60. a. write an equation that represents this situation. b. determine the age of each kid.