Visualizing the scenario is advantageous; creating a diagram would show a right triangle where the base measures 100 ft and the height is 25 ft. We can easily determine the angle using trigonometric functions as follows:
tan(theta) = 25 / 100
theta = 14.04 degrees

Begin by subtracting 379 from both sides of the equation.
This results in: 
Next, divide both sides by -24, which gives us: x = 13.
That corresponds to 13 weeks.
I can assist you a bit; here’s what I got correct.