Determine whether this mapping diagram is a function or not

How many zeros does this polynomial function, y=(x-8)(x+3)^2

Suppose that prices of a gallon of milk at various stores in one town have a mean of $3.71 with a standard deviation of $0.10. using chebyshev's theorem, what is the minimum percentage of stores that sell a gallon of milk for between $3.41 and $4.01? round your answer to one decimal place.

What integer is equivalent to 9 3/2