Aman buys six books from the store and a preferred reader discount card for $20. later that day, he goes and buys five more books. he also got a $5 discount using his new card. if he spent a total of $92 at the bookstore, how much did each book cost assuming every book cost the same?

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

D(5, 7). e(4,3), and f(8, 2) form the vertices of a triangle. what is mzdef? oa. 30° ob. 45° oc. 60° od 90°

Which of the following contains a variable?