1.) The mode is the number that's most frequent in a given list. In our list, we have 2, 4, 4, 5, 5, 5, 6, 6, 6, 6, 7, 9, 10. Our most frequent number is 6; therefore, our mode is 6.
2.) The median is the number in the middle of a list organized from least to greatest. 2, 4, 4, 5, 5, 5, 6, 6, 6, 6, 7, 9, 10; 4, 4, 5, 5, 5, 6, 6, 6, 6, 7, 9; 4, 5, 5, 5, 6, 6, 6, 6, 7; 5, 5, 5, 6, 6, 6, 6; 5, 5, 6, 6, 6; 5, 6, 6; 6. 6 is our median.
I hope this helps, despite your answer choices not providing the correct answer.
If you move the decimal point left until it is just to the right of the most-significant digit, the number of places you moved it is the power of ten that your new number is multiplied by.
Then multiplication can proceed in the usual way, taking into account the rules of exponents.