So, this wants us to find cos X, so 15 is the hypotenuse, 12 is the adjacent side, and 9 is the opposite side (this is only for the X angle). So, cah: cos=adj/hyp
So, cos=12/15
which equals to 0.80
So, the answer is A!
Stay Safe, Stay at Home (this answer was writtern during the corona virus times) =)
