A radioactive isotope obeys

MATHEMATICS · Subjective · A Level · Mathematics · Differentiation · Differentiation

Problem

\dfrac{dM}{dt}=-0.041M

, where

M

is measured in grams and

t

in years. If the initial mass is

50\text{ g}

, determine the time required for the mass to decrease to

15\text{ g}

. Provide the exact value of

t