Monday
March 30, 2015

Homework Help: math

Posted by Kristen on Sunday, June 23, 2013 at 12:30pm.

A researchr assistant made 160mg of a radioactive, and found that there was only 20mg left after 45hours.
a) What is the half-life of this substance?
b) Write a function to represent the amount of substance left after x hours
c) If the researcher kew he needed 100mg of the same substance 12 hours after he was able to make a fresh batch, how much should he initially make?

Please help.i have a feeling that something like this will b on my math exam
Please show some steps so I can understand how u get it.

Thanks a bunch I really appreciate it!:)

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Science - Radioactive substance decays so that after t years, the amount ...
calculus - The rate at which an amount of a radioactive substance decays is ...
Calculus - a certain radioactive substance is decaying so that at time t, ...
calculus - Carbon-14 is a radioactive substance produced in the Earth's ...
Alegbra - Andrew measures the amount of a very unstable substance to be 100 ...
algebra - Andrew measures they amount of a very unstable substance to be 100 ...
Math - A radioactive substance decays according to the formula Q(t) = Q0e−...
Math - A radioactive substance decays according to the formula Q(t) = Q0e−...
Math/Calculus - After 5 days, a particular radioactive substance decays to 37% ...
Math-Exponential Decay - A lab technician had 58 grams of a radioactive ...

Members