Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which position has a Nationality of united states, and a Player of roger powell?

### Inputs:
table_name: table, columns: ['Player', 'Nationality', 'Position', 'Years for Jazz', 'School/Club Team']

### Response:
SELECT Position FROM table WHERE Nationality = united states AND Player = roger powell