Astudent drops some metal paper clips in a box of sand. the student use a magnet to separate the metal paper clips from the sand. the reason this works is that the sand and paper clips together are a) a mixture b) an element c) a compound d) a substance

The answer is mixture.

Step-by-step explanation:

A mixture is a material that consists of two or more different physically combined substances; in this scenario the things are paper clips and sand.

Here, the student uses a magnet to separate the metal paper clips from the sand. So, here sand and paper clips together are a mixture.

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

(3x-8) or (3x+8)

step-by-step explanation: