Im not sure but i think it is 15 - x
1,050,200
The number between 1 and 10: 1
The power of 10: 6
The number in scientific notation: 1.05^6 or 1.050200^6
34,600
The number between 1 and 10: 3
The power of 10: 4
The number in scientific notation: 3.46^4

Now, If the exponent was negative like you asked....
Answer:
it goes by 2 two times then subtracts 3 then again
Step-by-step explanation:
10,12,9,11,8,10,7