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Help with Algebra problem?
A student is trying to determine the half-life of radioactive iodine-131. He measures the amount,A , of iodine-131 in a sample solution every 8 hours. His data are shown in the table.
Time(h) = Amount(g)
0 = 5.33
8 = 5.16
16 = 5
24 = 4.83
32 = 4.74
40 = 4.6
48 = 4.48
(a) Find an appropriate exponential model of the data points.
Amount at time t, A(t) = ?
(b) Find the half-life of idoine-131 according to the exponential model in part (a).
Half-life, t = ?
1 Answer
- nosiLv 48 years agoFavorite Answer
I'm guessing that if you are in this class, you have a graphing calculator. enter your data into L1 and L2, then run LinReg and tell it to StoreRegEQ in Y1. Should give you something like -.02075x+5.329. Looking at the table, you find the half-life to be about 128 hours.