book Maths Puzzle Numerical Ability

Find the three arithmetic means between 18 and -10

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book Other Question

If a map has a scale of 11/2 inches to the mile and if a distance between two points on the map is 9 inches apart, how much is that distance in actual miles?

The book says 6 miles. why? 11/2 * 9?? please help me i need to find all teh zeros for the polynomial function F(x)=2x^4-2x^2-40 and determine the multiplicity of each zero