Please answer the questions below:
The dash on questions
1. (3 * 10⁷) (9 * 10⁶)
2. 4 x 10⁹ / 5 x 10⁷
3. (11 x 10⁴) (7 x 10²)
4. 9 x 10⁵ / 10 x 10³
5. 4 x 10⁵ / 16 x 10²
6. (2 x 10³) (3 x 10⁴)
7. 3 x 10⁴ / 8 x 10