First find how many units of solution there is:
500* 2% = 500(.02) = 10 units
You need 10 units of solution in 'x' units of a 10% solution.
x*10% = 0.1x = 10 units -----> x = 10/0.1 = 100
100 units are needed
It is C: Given, Reflexive Property
Answer:

Step-by-step explanation:

Combine 

Combine the bottom, too.

Apply the fraction rule

Cancel

Therefore, 