Answer:The answer is A, 15 I believe if i did the math right.
Step-by-step explanation: First you take the equation: f(x)= 0.86x-0.09
Then you plug in x witch in this case is 18 so f(18)=0.86(18)-0.09= 15.39 So round to the nearest whole number and you get 15.
Actually I can help you in three of them as the number "3" is not confined between the arrays ND and NE
So:
It would be
angle END
or
angle DNE
or
angle N
81 more than x
more than means add
81 more than x
x+81 or 81+x