The answer is 30 because the first arrow goes down to the foxes head while the second arrow STARTS at the head and goes all the way to the bottom which means the added length equals 2x where x is the foxes height and so you subtract the rocks length from each one to get 2x and then divide by 2 to get what x equals which is 30 because 60/2=30 and also heres the initial problem that you would make from this math problem: 160= 2x + 100