Question

A 11 gram sample of a substance that's used to treat thyroid disorders has a k-value of 0.125
Find the substances half-life in days. Round your answer to the nearest tenth.

Answer 1

5.5 = 11e^(-0.125t)

solve for t

Answer 2

take logs to base e of both sides

Answer 3

I can't seem to do that on my calculator?

Answer 4

@welshfella

Answer 5

e^(-0.125t) = 5-5/11 = 0.5

-0.125t = ln 0.5

t = ln 0.5 / -0.125

Answer 6

5.5? @welshfella

Answer 7

yes

Answer 8

@welshfella Thank you!!