If cos y = 8/9 then what is the positive value of tan1/2y, in simplest radical form with a rational denominator?

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Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

How do you write y-10=2 (x-8) in standard form

Vertical angles must check all that apply