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This is a right triangle, and for y, you're given the opposite side and the hypotenuse. Which trigonometric function is that?
SJ2006
Here, sin y = P /H
sin y = 9 / 17
sin y = 0.52
y = sin⁻¹(0.52)

For exact value, you need to round off 0.52 to 0.50
y = sin⁻¹( 1/2 )
y = 30            [ 'cause, sin 30 = 12 ]

Your final answer is 30 degrees.

Hope this helps!

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