Answer:

Explanation:
9 x 9 x 9 x 9 is 9 multiplied by itself four times, so it's 9 to the 4th power as typed above.
Mount Everest is not a person, so whom and who cannot be used.
The phrase that the blank spot is in needs a transition word to flow correctly. 'that' does not flow, as it would make this phrase grammatically incorrect.
The answer is B. which.
Differant is spelled different
Answer:
1st question A2ndquestion3rd question , C4,B