Diameter x pi (3.14) OR 2 x radius x pi
X = 10 - y
I hope this helps.:)
Do you have a calculator? If so, divide the numerator by the denominator. For example... 2/7: take 2 divided by 7 and you get 28.6%
For this case we must simplify the following expression:
We must apply double C:
We apply distributive property in the numerator:
In the denominator we have by law of signs:
Different signs are subtracted and the sign of the major is placed:
ANswer:
Think about what a half-life means as a table.
years amount Left
20 1/2
40 1/4
60 1/8
80 1/16
Starting at t = 0, the amount left (or density) = (1/2)^(t/20)
For t =35, the decay factor = .297
Since you need to work backwards, divide by that factor. 6 / .297 = 20.18 mg per sq cm
