What is one fourth the amount of salt as an algebraic expression

What is the distance between (–2 1/2,-3) and (1, –3)?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Henry's butcher shop uses an electronic scale that measures to 1/100 of a pound. which is the most accurate measurement based on the limitations of the scale that might be found on a package of meat sold by henry?