Write a differential equation that fits the following situation: the rate of change of a radio-actively decaying substance is $\displaystyle -{0.94}$ times the amount of the substance $\displaystyle {A}$ remaining at time $\displaystyle {t}$.

$\displaystyle \frac{{{\left.{d}{y}\right.}}}{{{\left.{d}{x}\right.}}}=$ Preview Question 6