Question

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 help with the calculation c. How you can determine the sign of the result

Answer 1

put a dot at "a" on the number line.
to find
a - b
start at a and count "b" steps to the *left*
where you end up is a - b
(if we start at a and count b steps to the *right*, that would be adding: a+b)

Answer 2

Thanks!