A convenience store sell pre-paid mobile phones. It purchases them for $12 each and uses a mark up rate of 250%. a. The markup rate is the constant of proportionality in the equation y= kx. Write an equation that can be used to find the amount of markup on the cost x of a phone

b. Use the equation to calculate the markup amount. What is the retail price of a phone?

c. Next week the store is going to reduce the price to $31.50. Calculate what percent the sale price is of the retail price.

d. Based on your answer to part C, what is an equation in the form y = kx that relates the sale price to the retail price x?

Prove that 3: 8 is equivalent to 12: 32.a. use diagrams to support your answer.

Ahypothesis is: a the average squared deviations about the mean of a distribution of values b) an empirically testable statement that is an unproven supposition developed in order to explain phenomena a statement that asserts the status quo; that is, any change from what has been c) thought to be true is due to random sampling order da statement that is the opposite of the null hypothesis e) the error made by rejecting the null hypothesis when it is true

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.