Question 1092503
<br>The plane is flying at a constant rate, so the function will be linear, of the form
{{{y = mx+b}}}
or
{{{f(t) = m(t)+b}}}<br>
In that equation, b is the y-intercept (f(0) -- the distance of the plane from B at t=0, when it flies over A.)  And m is the slope (rate of change; i.e., how fast the distance from B is changing -- i.e., the speed of the plane).<br>
So b is 2160 (when the plane flies over A, it is 2160 miles from B), and m is -500 (the distance of the plane from B is decreasing at the rate of 500 miles each hour).<br>
And so the function is<br>
{{{f(t) = -500t + 2160}}}