I dont know if this is what you need hope it helps
Answer:
On 6
Step-by-step explanation:
On 6 to show that it continues
b. 7+21
If you do 1+3=4 and then 4 times 7 that equals 28. When you do 7+21 that equals 28 too. So b is the answer
hope this helps if not im sorry
(2^3)^5
=2^(3*5)
= 2^15