book Maths Puzzle Numerical Ability

You are approaching the island of Hawaii in a small boat. The highest point on Hawaii is Mauna Loa at 13,677 feet. You see it just barely above the horizon. The radius of the Earth

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How do i do this problem

(1/2y^2 z+ 3/4yz-1/8z^2)+(3/4y^2 z+3/4yz+z^2) x<5
x>-4