Question

a helicopter descends until it reaches the ground. the equation $y = -300x + 1200$ gives the height, $y$, in feet, $x$ minutes after the pilot begins the descent. how long does it take the helicopter to reach the ground? \boxed{} minutes

Explanation:

Step1: Set height to 0 (ground level)

$0 = -300x + 1200$

Step2: Isolate the x-term

$300x = 1200$

Step3: Solve for x

$x = \frac{1200}{300}$

Answer:

4 minutes