Question

A certain radioactive substance decays exponentially such that a 500 gram sample
decays to 180 grams in 26 days.
(a) Construct a function formula that expresses the number of grams remaining, N,
as a function of time, t, measured in days.

Answer 1

Do you know how to start?

Answer 2

N(t) o.O

Answer 3

where did the e and ln come from?

Answer 4

and 0.36? :/

Answer 5

The function is exponential? What math class is this?

Answer 6

calculus 1

Answer 7

Is there a formula?