Answer:
15/17
Step-by-step explanation:
Cosine is equal to adjacent/hypotenuse. Since we don't have the hypotenuse in this case, we need to solve for it.
15^2+8^2=c^2
c=17
We get 17 for the hypotonuse.
Plug it into the equation adjacent/hypotenuse and you get 15/17
