Answer:
60.5 milligrams per square centimeter First, determine how many half lives have expired by dividing the time by the half-life. So: 55/20 = 2.75 That means that only 2^(-2.75) = 0.148650889 = 14.8650889% of the original substance remains. So just divide the amount remaining by 0.148650889 to get the original amount. 9 / 0.148650889 = 60.5445419 So originally, there was 60.5 milligrams per square centimeter 55 years ago.
you know that (0,3) is a point and (1,1) is another point.
so now you have to replace them in the follow equations.
i did that and the right answer is the first equation => y=-2x+3
I think your best answer is a pasture that is 75 feet by 150 feet, which will give you 11,250 sq ft of pasture
3/4=x/60 so you divide 60 by 4 and get 15x3=45/60
6/40 is equalvilant because all you have to do is double or simplify it by 2