Answer:
711 ft (nearest foot)
Explanation:
Create two equations using trig ratios and the information given (refer to the attached diagram). Equate the equations and solve.
First equation
Let y = horizontal distance between sensor 1 and the aircraft
Let h = height of aircraft above the ground
Using the tangent trig ratio:

Given:
- angle = 20°
- side opposite the angle = h
- side adjacent the angle = y

Rearrange to make y the subject:

Second equation
Let y + 700 = horizontal distance between sensor 2 and the aircraft
Let h = height of aircraft above the ground
Using the tangent trig ratio:

Given:
- angle = 15°
- side opposite the angle = h
- side adjacent the angle = y + 700

Rearrange to make y the subject:

Now equate the 2 equations and solve for h:






Therefore, the height of the aircraft is 711 ft (nearest foot)