Which graph represents a proportional relationship?

Is a square always, sometimes, or never a parallelogram

What are the solutions of the equation x4 – 5x2 – 14 = 0? use factoring to solve. someone !

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.