exam Maths Puzzle Numerical Ability

3√9
3√54

division

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exam Other Question

The school board estimates that there will be a 2.5% increase in enrollment for next year. If the present enrollment is 8,657, what is the estimated enrollment? (4 sqrt s + 11 sqrt t)(4 sqrt s - 11 sqrt t)

To me, this is a difference of squares. How is the anser written??