Question

The half-life of a substance is how long it takes for half of the substance to decay or become harmless (for certain radioactive materials). The half-life of a substance is 123 days and there is an amount equal to 150 grams now. What is the expression for the amount A(t) that remains after t days, and what is the amount of the substance remaining (rounded to the nearest tenth) after 365 days?

Hint: The exponential equation for half-life is A(t) = A0(0.5)t/H, where A(t) is the final amount remaining, A0 is the initial amount, t is time, and H is the half-life.

Answer 1

A(t) = 150(0.5)t/123, 19.2 grams remaining
A(t) = 150(0.5)123t, 1.4 grams remaining
A(t) = 123(150)(0.5)t, 0.0 gram remaining
A(t) = 150(0.5)123/t, 118.8 grams remaining

Answer 2

@Kainui

Answer 3

@RUNNER01

Answer 4

ok lets look

Answer 5

whats the problem

Answer 6

the statement at the top

Answer 7

i see han on ill give you the answer

Answer 8

are you sure

Answer 9

i think try and find out if not ill fail this test im on for you

Answer 10

could you help me with three more questions

Answer 11

@RUNNER01

Answer 12

pm messages tho ok becuaes i hate when i have people see how i do this

Answer 13

okay so do i close this question ?

Answer 14

yea