Match the y-coordinates with their corresponding pairs of x-coordinates on the unit circle. the x coordinates to choose from are: - 2 times the square root of 10/11 - 4 times the square root of 6/11 - 1 / the square root of 11 - 6 times the square root of 2/11

Of the four x-coordinates to choose only 1/√ (11) belongs can belong to the unit circle.

The other three x-coordinates are greater than 1, then they are out of the unit circle.

The unit circle formula is x^2 + y^2 = 1

Then to find the y-coordinate given the x-coordinate you can solve for y from that formula:

y^2 = 1 - x^2

y = (+/-) √ (1-x^2)

Substitute the value of x

y = (+/-) √{1 - [1/√ (11) ]^2} = (+/-) √{ (1 - 1/11} = (+/-) √ { (11 - 1) / 11 = (+/-) √ (10/11) ≈ + / - 0.95