Message from C, C++ talks
You are welcome :)
Just break every task on parts.
So, you need:
1. Declare 2 arrays
(learn what is arrays in C++ and how to work with them)
2. Get from user 8 numbers into first array
(learn loops, user input,
3. Use function
<cmath> header and raise your numbers to a power. Store result in the second array.
4. Output second array to screen.
std::cin and basic I/O handling in C++)
Good luck to you.