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:
b or c
Step-by-step explanation:
Answer:
16y=13x
Step-by-step explanation:
this honestly doesn't make sense but this is as much as i could simplify
Answer: .95
Step-by-step explanation: There are 2 quarts and in each quart there are 2 pints. 1 quart would cost $1.90 and half of that which would be a pint is .95.
We know that functions are mathematical entities that assign unique outputs to given inputs. In other words, a function can't have repeated values in the input repeated x-value.
For example consider the relation {(1,4), (1,5), (2,6), (3,7), (4,8), (5,9)}.
We see that above relation has repeated x-value "1" which is assigned to two different output values 4 and 5. So by definition of function, above relation can't be a function.