multiply. write the result in scientific notation.

(1.7 ⋅ 10-^4) (5⋅ 10-^5)

choices:

8.5 ⋅ 10-^9
8.5 ⋅ 10^20
6.7 ⋅ 10-^9
6.7 ⋅ 10^20