Answer:
Pythagorean theorem 
Step-by-step explanation:

Answer:
17
Step-by-step explanation:
a[2]+b[2]=c[2]
8*8+15*15=hypotenuse.
64+225=289

hypotenuse=17
Answer:
Answer is 500
btw did round sorry
Step-by-step explanation:
First year
4,000 divided by 2,000=2,000
Second year
2,000 divided by 2=1,000
Third year
1,000 divided by 2=500
Answer: -38
Step-by-step explanation:
First he would have to walk back 19 steps to get back to his orginal position, then he would have to further go back another 19 steps.