The mass of a sample of the chemical element Einsteinium-253 after it is initially measured is represented by the following table. Time( weeks)=
0
3
6
9
12
15

Mass(grams)=
400
201
98
50
24
12

Which model for M(t), the mass of the sample t weeks after it’s initially measured, best fits the data?

Choose 1 answer=
A= M(t)=400•(0.5)^ t
B= M(t)=400•(0.79)^ t
C=M(t)=400-200• t
D=M(t)=400-12• t

The point a is at –2 and the point b is at 7. marissa would like to divide this line segment in a 4: 3 ratio, and she would like to use the formula x = (x2 – x1) + x1. what values should she substitute into the formula? a = a + b = x1 = x2 =

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