Since it has a half life of 60 days, this means that every 60 days it multiplies by 0.5. Since it asks for 300 days, your equation is 500*(0.5)^5, which is 15.625 mg left after 300 days.
Well is the length is 4 ft, and 1 ft is 12 inches we need to do 12×4, which is 48.
So now we know that the length is 48, and the height is 4, so it would be 48×4, which gives us our answer, 192 inches!
I think that would be a rhombus.
ANSWER
D. 14
EXPLANATION
The ratio of the books in the book case are:
Red:Yellow:Green=3:5:2
The number of yellow books in the book case is 35.
If 5 corresponds to 35, then 2 green books will correspond to a less number of books,
By proportion, because it is going to be less more will divide.
The number of green books in the book case is

