Eugene wants to use the cosine ratio to calculate $y$ in 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. Write an equation and solve for $y$ using cosine.

   Partial Answer (b):

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