exam Maths Puzzle Numerical Ability

As light penetrates a body of water , its intensity"I" measured in candela/cm^2 decreases exponentially. For one particular pond it is known that the light intensity at the surface

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When graphed using polar coordinates, the center of a regular nonagon is at the origin and one vertex is at (6, 0 degrees) or (6,0 radians). Find the polar coordinates of the other verticles in both degrees and radians. what is the distance 6.5 miles traveling at 5mph?