A boat is looking at a plane 8000 ft in the air at a 40 degree angle from x feet away solve for x

Question

6,713 ft
9,534 ft
10,443 ft
12,445

Answer 1

if x is line-of-sight,
8000/x = sin 40°

if x is along the ground,
8000/x = tan 40°

Answer 2

Got it thanks.

Answer 3

I need this actual answer if anyone knows???