Selena is planning a birthday party for her little sister at a local zoo. The price depends on the number of children that attend the party. The price per child is normally $5. However, if there are more than 12 children in a group, the group can pay an $18 fee plus $2 per child. Which piecewise-defined function best models the cost of the party c(x) if Selena invites x children?

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