exam Maths Puzzle Numerical Ability

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?

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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 graph the two lines y1=3*-5 and y2=-7x+4on the same graph. use algebra to find the coordinates of their point of intersection to 3 decimal places