Literally only the first one is correct.
Answer:
-3 , 6
Step-by-step explanation:
The series of numbers is adding 5 and then subtracting 2
20+5=25
25-2=23
23+5=28
28-2=26
and so on. Do you understand?
Answer:
15
Step-by-step explanation:
a²+20²=25²
a²=625-400
a²=225
a=15
