exam Maths Puzzle Numerical Ability

Write using positive exponents, and simplify if possible.
(-6x)^-3

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exam Other Question

fred begins walking toward johns house at 3 mi/h. john leaves his house at the same time and walks toward freds house on the same path at a rate of 2 mi/h. how long will it be begore they meet if the distance between the houses is 4 miles? Solve. 16x^3-x