Compare and contrast codominance and incomplete dominance.

Co dominance is when the offspring inherits the trait of the mother and of the father. Like a black cat and a white cat's offspring will be a spotted black cat with maybe white spots.
Incomplete dominance is when both of the traits are combined. Like when the offspring of a red flower and a white flower will give you a pink flower.
However, both co dominance and incomplete dominance are results of mixed traits.
Hope this helps. 

This is what i did 45-5=4040÷4=10so there are 10 white marbles but am not sure is just a question that am not sure

They use the si unit, or metric system its all the same thing