To me the answer is 6.4 and welcome get a good grade
Help with what? I am not sure what other question you asked that you need help on. What is the question?
Answer:

Step-by-step explanation:
Factor 

Rewrite Equation

Answer:
15.95 feets
Step-by-step explanation:
Given that:
Angle of elevation = 62°
Using trigonometric relation :
Tanθ = opposite / Adjacent
From the drawing attached :
Opposite = 30 feets
Distance between girl and lighthouse = d
Tan 62 = 30 / d
1.8807264 * d = 30
d = 30 / 1.8807264
d = 15.951283
d = 15.95 feets