Find rotational symmetry
sorry about the cringy drawing but y'all get the idea right

Which of the following best describes the delian problem?

Use sigma notation to represent the following series for 9 terms.

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?