A 25 gram sample of a substance that's used for drug research has a k-value of 0.1205. Find the substance's half life in days, round to the nearest tenth.

Complete Question

Situation: A 25 gram sample of a substance used for drug research has a k-value of 0.1205.

Find the substance's half-life in days, round to the nearest tenth.

5.8 days

Step-by-step explanation:

The decay model for drugs and radioactive substances is given as

The half-life of any substance is the time it takes for the substance to decay to half its initial amount. That is the period it takes for:

If we substitute this into the model, we obtain:

We can solve for t.

Taking the natural logarithm of both sides

answer: sorry

step-by-step explanation: can you tell me pls how to find the rational of two integers

answer: b. f(x) = (x + 2)^3 (x^2 - 7x + 3)^4

step-by-step explanation:

polynomials always have as many roots as their order. this is a 4th order polynomial- hence 4 roots!

complex roots of polynomials always come in pairs. the quadratic equation has the "+/-" in that will alwaysgenerate m+ni amd m-ni, so 7-2i must be a root of this polynomial equation.

the order of the numerator and denominator are both 2. so the horizontal asymptote is y=a2/b2 =7

verticle asymptotes are the forbidden x-values. f(x) becomes undefined at x=-3 because this value will cause a zero denominator.

a graph of r(x) will have vertical asymptotes at ±1 because these values will make the denominator zero. so the domain of the function cannot include ±1.

you 're wlecome! : )

cretdit to source