Pl . 1. if a and b are any two real numbers, explain how you calculate the difference a – b. be sure to include the following in your explanation: . a. a description of the relationship between addition and subtraction . b. how you can use a number line to with the calculation . c. how you can determine the sign of the result

The difference of a and b can be calculated by using directly the subtraction operation to the two given variables. In this case, we can use the number line by locating first the places of the numbers and counting the places from b to reach a . The number of places or jumps is the difference. The sign of the difference depends on the signs of a and b is a>b then the difference should be positive; otherwise, the result is negative.