exam Maths Puzzle Numerical Ability

Determine the solutions for the following polynomial.
9x^5 - 21x^4 = 0

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exam Other Question

The average of the intergers from 200 to 400, inclusive, is how much greater than the average of the integers from 50 to 100, inclusive? Identify the rate, base, and amount in each statement or question. HELP ME!Please. I am aweful at all of this stuff?
150 is 75% of what number?