Question

SOmeone help me please

2. The half-life of a radioactive substance is the time it takes for half of the substance to decay. Phosphorus-32 has a half-life of 14.3 days.

a. Write an exponential decay function for a 50 mg sample.

b. How much phosphorus remains after 84 days?

Answer 1

half life means you can use \(\frac{1}{2}\) as the base of your exponential function

Answer 2

starting with 50 grams means the 50 goes out front

Answer 3

14.3 days means divide \(t\) by \(14.3\)

Answer 4

set it up as \[\huge f(t)=50\left(\frac{1}{2}\right)^{\frac{t}{14.3}}\]

Answer 5

f(t)=50

Answer 6

right?

Answer 7

i wrote \(f(t)\) above

Answer 8

i know?

Answer 9

im lost :/