The answer would be 56/299
The answer to the question
The distance of plane from the starting point is 69.46 km.
Given that the plane first flies 35 km in the direction N30W and then 60 km in the direction N60E.
We have to find the distance of plane from starting point.
We have to use pythagoras theorem in this which says that the square of hypotenuse is equal to sum of squares of the base and perpendicular.

From the figure we can say that P=35 km .and B=60 km
In this we have to find the value of H when P=35 and B=60

=1225+3600
=6946
H=69.46
Hence the distance of plane from starting point is 69.46 km.
Learn more about pythagoras theorem at brainly.com/question/343682
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One crop of brake ferns can reduce the pollutant concentration by 15 mg/m^2, so the equation must contain the number 15 multiplied by c, the number of crops of brake ferns.
Since the brake ferns reduce concentration, the sign must be -15c.
The only choice that fits this is Choice C) 170 - 15c = 5