Answer:
6.9
Step-by-step explanation:
The angle of depression of object from the top of the mountain = angle of elevation of the top of the mountain from the object = 30⁰ ( alternate angles ).
Let x be the distance of the object and the foot of the mountain
Given that the height of the mountain is 4m, then
using Trigonometric ratio,
tan 30⁰ = 4 / x
x = 4/tan 30⁰
x = 6.9282
x = 6.9 to the nearest tenth.