Question

Iodine-131 is a radioactive material with half-life of eight days. A scientist starts with 100 grams of iodinie- 131. Which function can be used to estimate the number of grams of iodine-131 remaining at the end of x days?
A. f(x)= 100(0.92)^x

B. f(x)= 100 (1.09)^x

C. f(x)= (0.92)^x

D. f(x)= (1.090^x

Answer 1

Answer:

poop

Step-by-step explanation:

poop

Answer 2

The correct answer is Choice A.

This is an example of an exponential equation, so we need the formula $y=ab^x$.

The a value is the starting value of 100. The b value must be a decimal lower than 1 because it is decreases.

If you substitute in 8 for x, you will see that the output is about 50 (half of 100).