Distance of A from cliff = 1500·arctan(30°) ≅ 723.5 ft
distance of B from cliff = 723.5+1000√3 ≅ 2455.6 ft
tanθ = 2455.6/1500 = 1.637
θ = arctan(1.637) ≅ 58.6°
angle of depression = 90-θ ≅ 30°
Order of operations
PEMDAS
parenthasees
exponents
multipication or division whichever comes first
addition or subtraction whichere comes first
first muliplication
-3/7 times 7/10=-21/70=-3/10
then we have
-2/5-3/10
make bottom number 10
-2/5=-4/10
-4/10-3/10=-7/10
answer is A
