What is the function rule for the following situation? rex paid $20 for a membership to the pool and pays $300 each time he goes to the pool.
y = 20x + 3
20 = 3x + y
y = x + 20
none of these

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.