book Maths Puzzle Numerical Ability

x<5
x>-4

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book Other Question

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 please help me. I am trying to find the vertex, domain and range of
y = x^2 - 4x. my graph is not coming out right.