Question

The graph models the decay of a sample of iodine-125, where x is the time that has passed and y is the amount remaining in the sample in grams.

What was the size of the sample at the beginning of the experiment?

A. 12.5grams
B. 25grams
C. 50grams
D. 120grams

Answer 1

answer is C 50 grams

Explanation:

Answer 2

option C. 50 grams

Explanation:

we know that

The size of the sample at the beginning of the experiment is equal to the y-intercept or initial value of the function

Remember that the y-intercept is the value of y when the value of x is equal to zero

In the context of the problem, the y-intercept is the size of the sample at the beginning of the experiment (x=0)

Looking at the graph

For x=0, y=50

therefore

The size of the sample at the beginning of the experiment was 50 grams