exam Maths Puzzle Numerical Ability

Okay, I guess I did not get it. the little 3 outside the square root of 8y^3

please explain.

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exam Other Question

Adult tickets for a play cost $17 and child tickets cost $10. If there were 33 people at a performance and the theater collected $421 from thicket sales, how many children attended the play?
The questions state:

Find all values of y such that the distance between (3,y) and (-2,9) is 12.

I am stumped and need help PLEASE!

thanks!