Eugene wants to use the cosine ratio to find $y$ on this triangle.  

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

   Hint (a):

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

2. Set up an equation, and solve for $y$ using cosine.

   Hint (b):

   $\cos29º=\frac{y}{42}$