Show that all of the powers in the prime-power factorization of an integer n are even if and only if n is a perfect square

The heaviest 16% of all men in weight weigh more than how many pounds ?

What is the equation of a line passing through the point (6,1) and parallel to the line whose equation 3x=2y+4

Aprofessional hockey team has noticed that, over the past several seasons, as the number of wins increases, the total number of hot dogs sold at the concession stands increases. the hockey team concludes that winning makes people crave hot dogs. what is wrong with the hockey team's conclusion? a) it does not take into account the attendance during each season. b) it does not take into account the number of hamburgers sold during each season. c) it does not take into account the number of concession stands in the hockey arena. d) it does not take into account the number of seasons the hockey team has been in existence.