Question

7. In 2004, a sample of a radioactive substance had a mass of 300 milligrams. Since

then, the sample has decayed by 4.6% each year. Let t be the number of years since
2004. Let A(t) be the mass of the substance in milligrams. Write an exponential
function modeling this relationship.

Answer 1

Below

Explanation:

.046 is lost each year meaning (1 - .046) remains

A(t) = 300 ( 1 - .046)^t will show milligrams remaining after 't' years (where t is the years since 2004)