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Answer: 3
Step-by-step explanation:
Let E be the event of that student pierces ear and N be the event of that student pierces nose.
Given: 

For any two event A and B, we have

Similarly , 

Hence, 3 students have piercings both on their ears and their noses.
Answer: Ellen's house is farther away by 898 feet.
Step-by-step explanation:
Given: The distance between Haley's house and Ellen's house = 1.41 miles
We know that 1 mile = 5,280 feet
Then, 
The distance between Haley's house and Dirk's house = 6,547 feet
Clearly, 6,547<7,444.8
And 
Therefore, Ellen's house is farther away by 898 feet.
D
C
Sorry if both aren't correct, it's been a while since i did this...