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Answer:
I don't know the answer to this one, sorry
<span>You would have to wait 318 years for 1/5 (20%) of the Radium to disappear. 1590 is the point where half of the Radium would decay, so if you take 20% of that, it would equate out to 318 years. Radium has a long half life!</span>
Y=f(x) between x=a and x=b, integrate y=f(x) between the limits of a and b
Actually there are three shapes that can be classified as a parallelogram.
Square, Rectangle, and Rhombus
