exam Maths Puzzle Numerical Ability

Could someone please help me to simplify
(sqrt) 72x^2y^5

Thanks in advance for your help

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exam Other Question

Suppose you see the two summer jobs advertised at the right. Let x= the amount of sales and y= money earned in a week.

cellular phone sales: y=150+0.2x
stereo sales: y=200+0 Given the following two points, (-4, -2) & (-1, -5), develop an equation in the slope-intercept format