› Forums › Algebra › Please help me on this. On my homework I have the problem
This topic contains 5 replies, has 4 voices, and was last updated by ÜberMathGuru 4 years, 11 months ago.
What value in terms of c must b have to make this expression a perfect square?
polonium-210 is a radioactive element with a half-life of 140 days. This means that half of the polonium decays every 140 days. If 400 mg is the initial sample how much is left after 700 days?
and what is the formula?
Sorry for the delayed response!
The basic equation for half life is
AT = A0 2^(-T/H)
where A0 is the initial radioisotope’s activity, AT is the decayed activity after time T, and H is the half-life.
These values in your problem would be:
and AT is what they are asking for.
AT=400x[2^(-700/140)]=400×2^(-5)= 400x (1/2^32) = 400/32= 12.5 mg
what are all the variables of a graph
Always multiply the outer exponent by the exponent of each factor (or by both the exponent of the numerator and the denominator if it is a ratio)!!!!
You must be logged in to reply to this topic.
Comments are closed, but trackbacks and pingbacks are open.
If you already have a YourMathGuru® account, sign in below
Lost your password?
Copyright © 2011 - All Rights Reserved - YourMathGuru®