If a>0 and b<0, which of the following must be true: a. ab>0 b. a-b>0 c. b-a>0

Question

If a>0 and b<0, which of the following must be true: a. ab>0 b. a-b>0 c. b-a>0

Answer 1

a. If I multiply a positive number to a negative number, do I always end up with a positive result?

 

b. If I have a positive number and I subtract a negative number, is the result always positive?

 

c. If I have a negative number and subtract a positive number, is the result always positive?