A stack of boxes has 17 rows. The bottom row has 40 boxes, and the top row has 8 boxes. Assuming that the sequence of numbers that gives the number of boxes in succeeding rows is arithmetic, how many boxes does the stack contain? The stack contains boxes.

Bob owns 7 different books. He wants to arrange all of these books left-to-right on a single bookshelf. How many distinguishable ways can Bob do this?

You are a thief overhearing someone's safe combination, which consists of a 5-digit number sequence. You are sure that the combination code contains at least two 6. How many codes would you have to potentially check to open the safe?

Select the number line that shows that two opposite numbers have a sum of 0. A. B. C. D. -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 6 4 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 2 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 3 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 SUBMIT