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

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.