A scientist has 20 grams of the radioactive isotope sodium-24. The isotope decays exponentially as shown in the table.
Time (hours)
Mass (grams)
5
10
15
20
25
30
15.9
12.6
10
7.9
6.3
5
Which equation best represents the curve of best fit for this set of data?
OA. (x) = 10-0.5⁰
OB. f(x)=-0.5-18.5*
OC.
f(x)= 15.9 1.045*
OD. f(x)=20-0.955*
