book Maths Puzzle Numerical Ability

I am working on finding distance. However, I cannot figure out how to get an approximate answer from a square root on the calculator. Example:

square root 19 + 2 square root 35

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A boat that can travel 8 miles per hour in still water can travel 15 miles w with the water's current in the same time that it can travel 9 miles against the water's current. What please help me solve this equation 5x^2 + 33x -14 = 0 i know the answer is 0.4 but dont know how to show this or to work it out the proper way