A radioactive substance has a half-life of 1620 years. (A) If its mass is now 6.8 grams, how much will be left after 642 years?

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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This is differentials Equation subject... please help me about this one:

 

Instructions: Topic: APPLICATIONS OF 1ST ORDER DIFFERENTIAL EQUATIONS


Provide what is needed. Show your full solutions, no shorthand. Do not approximate
the value of k, do approximation after you find your final answer.

A radioactive substance has a
half-life of 1620 years.
(A) If its mass is now 6.8 grams,
how much will be left after 642
years?
(B) Find the time when 2.4 grams
of the substance remain.

 

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