How to find third vertex of a triangle

Afudge recipe calls for 1/2 cup of cocoa if only 1/2 of the recipe is made to how much cocoa should you use

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)

There are 10 chicks on ginger's farm .she has 2 chicks in one outdoor pen and 5 chicks in another. the rest of the chicks are in the barn.what is the fraction of total chicks in outdoor pens?