The Emerald City's population density shrunk throughout the 1970s. In 1970, the population density was approximately 7740 people per square mile, and it was shrinking at a rate of 0.79 percent per year.
a) If this trend had continued, find a formula for the population density, $D(t)$, of the Emerald City $t$ years after 1970.
$D(t) =$
b) Assuming this trend continues, predict the population density of the Emerald City in 1987 using your function from part (a).
people per square mile

Hint: