book Maths Puzzle Numerical Ability

simplify the cubed root of -243x^3y^10

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book Other Question

How many three-digit counting numbers are even? How many five-digit counting numbers contain at least one 6?

I had the answer of 400 = 10 x 10 x 4, but I was told that this was
in the polynomial below, put it in standard form, what is the degree, leading coefficient and the coefficient of y variable term?


5xpower2 - 2x + 10y - 6xpower 2 - 7 + x