exam Maths Puzzle Numerical Ability

I have 3 different problems that I am confused about. Please help me. The 1st one is2+3*5square root2-7. #2) (4/2)+4(5-2)square root 2. #3)-8-81/9*2square root 2+7. Can you pleas h

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2, 4 Express this following rational expressions in lowest terms, please!

4x^2 - 12x - 40 OVER 2x^2 - 16x + 30

wow... need help! thanks. A formula for calculating the distance d one can see from an airplane to the horizon on a clear day is d=1.22x^1/2, where x is the altitude of the plane in feet and d is given in miles. How far can one see to the horizon in a plane flying at 28,000 feet?