Question

MrsEHolt Help [GEOMETRY!] [EASY PEASY LEMON SQUEEZY]

Answer 1

AC is the adjacent leg to C and BC is the hypotenuse.  So we're talking about the cosine:

$\cos C = \dfrac{AC}{BC}$

For part 2, the co in cosine means "complementary" so cos x equals the sine of the complementary angle, that's going to be

$\sin y$

Answer 2

The other person is right so I am not going to try and act like I got the answer before her or copied her