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7-81.
1. Eugene wants to use the cosine ratio to calculate y in this triangle. Homework Help ✎

1. Which angle should he use to write an equation and solve for y using the cosine ratio? Why?

2. Write an equation and solve for y using cosine.

He'll need the adjacent side and the hypotenuse. To which angle is y adjacent?

$\cos \left(29\degree \right)=\frac{y}{42}$